Biology
Darwin's Origin, Huxley — popular-level Victorian/Edwardian science writing.
Pharmacographia A history of the principal drugs of vegetable origin, met with in Great Britain and British India
Flückiger, Friedrich A. (Friedrich August) & Hanbury, Daniel
23,506 downloadsen2022Origin of Cultivated Plants The International Scientific Series Volume XLVIII
Candolle, Alphonse de
19,376 downloadsen2014The Natural History of Pliny, Volume 3 (of 6)
Pliny, the Elder
18,060 downloadsen2019Difficulty 38 (High School)The Natural History of Pliny, Volume 5 (of 6)
Pliny, the Elder
14,594 downloadsen2019An Introduction to Entomology: Vol. 3 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
13,460 downloadsen2013Life and Letters of Charles Darwin — Volume 1
Darwin, Charles
11,685 downloadsen2000An Introduction to Entomology: Vol. 4 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
11,356 downloadsen2013On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life
Darwin, Charles
11,346 downloadsen1998The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told
Thomson, J. Arthur (John Arthur)
10,499 downloadsen2007On Growth and Form
Thompson, D'Arcy Wentworth
9,996 downloadsen2017The Animal Parasites of Man
Fantham, Harold Benjamin & Braun, Max & Stephens, J. W. W. (John William Watson) & Theobald, Fred. V. (Frederick Vincent)
8,063 downloadsen2018The Evolution of Marriage and of the Family
Letourneau, Ch. (Charles)
7,954 downloadsen2022An introduction to the study of mammals living and extinct
Flower, William Henry & Lydekker, Richard
7,705 downloadsen2025Letters of Asa Gray; Vol. 2
Gray, Asa
7,574 downloadsen2017More Letters of Charles Darwin — Volume 1 A Record of His Work in a Series of Hitherto Unpublished Letters
Darwin, Charles
7,478 downloadsen2001Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
Masters, Maxwell T. (Maxwell Tylden)
7,460 downloadsen2007Fossil plants, Vol. 2 : $b A text-book for students of botany and geology
Seward, A. C. (Albert Charles)
7,172 downloadsen2022The Notebooks of Leonardo Da Vinci — Complete
Leonardo, da Vinci
7,007 downloadsen2004Travels in Peru and India While Superintending the Collection of Chinchona Plants and Seeds in South America, and Their Introduction into India.
Markham, Clements R. (Clements Robert), Sir
6,643 downloadsen2017Manual of the Trees of North America (Exclusive of Mexico) 2nd ed.
Sargent, Charles Sprague
6,446 downloadsen2014Lichens
Smith, Annie Lorrain
6,287 downloadsen2020The Cambridge natural history, Vol. 02 (of 10)
Beddard, Frank E. (Frank Evers) & Benham, W. B. (William Blaxland) & Gamble, F. W. (Frederick William) & Hartog, Marcus & Sheldon, Lilian
6,268 downloadsen2023The Cambridge natural history, Vol. 01 (of 10)
Hartog, Marcus & Hickson, Sydney J. (Sydney John) & MacBride, E. W. (Ernest William) & Sollas, Igerna Brünhilda Johnson
6,020 downloadsen2023A Manual of Philippine Birds
McGregor, Richard C. (Richard Crittenden)
5,852 downloadsen2014The Cambridge natural history, Vol. 03 (of 10)
Cooke, A. H. (Alfred Hands) & Reed, F. R. C. (Frederick Richard Cowper)
5,819 downloadsen2023The Variation of Animals and Plants Under Domestication, Vol. I.
Darwin, Charles
5,681 downloadsen2008Handbook of Birmingham Prepared for the Members of the British Association, 1886
British Association for the Advancement of Science
5,355 downloadsen2015Darwin, and After Darwin, Volumes 1 and 3 An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
Romanes, George John
5,209 downloadsen2008Explanation of Terms Used in Entomology
Smith, John Bernhard
5,174 downloadsen2007A History of North American Birds; Land Birds; Vol. 3 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
5,046 downloadsen2017Makers of British Botany; a collection of biographies by living botanists
Unknown
5,030 downloadsen2014A Text-book of Entomology Including the Anatomy, Physiology, Embryology and Metamorphoses of Insects for Use in Agricultural and Technical Schools and Colleges as Well as by the Working Entomologist
Packard, A. S. (Alpheus Spring)
4,985 downloadsen2021On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)
Darwin, Charles
4,862 downloadsen2007Sketches of the Natural History of Ceylon
Tennent, James Emerson, Sir
4,742 downloadsen2004The Origin of Man and of His Superstitions
Read, Carveth
4,741 downloadsen2014Difficulty 59 (Graduate)Evolution, Old & New Or, the Theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin
Butler, Samuel
4,646 downloadsen2007Difficulty 57 (Graduate)The works of Francis Maitland Balfour, Volume 2 (of 4) : $b A treatise on comparative embryology: Invertebrata
Balfour, Francis M. (Francis Maitland)
4,572 downloadsen2014Galen: On the Natural Faculties
Galen
4,555 downloadsen2013Difficulty 65 (Academic)The Cambridge natural history, Vol. 07 (of 10)
Boulenger, George Albert & Bridge, T. W. (Thomas William) & Herdman, W. A. (William Abbott), Sir
4,527 downloadsen2024Cassell's Natural History, Vol. 1 (of 6)
Unknown
4,403 downloadsen2017The Insect World Being a Popular Account of the Orders of Insects; Together with a Description of the Habits and Economy of Some of the Most Interesting Species
Figuier, Louis
4,323 downloadsen2014Fossil plants, Vol. 3 : $b A text-book for students of botany and geology
Seward, A. C. (Albert Charles)
4,247 downloadsen2025The Microscope. Its History, Construction, and Application 15th ed. Being a familiar introduction to the use of the instrument, and the study of microscopical science
Hogg, Jabez
4,220 downloadsen2020Fossil plants, Vol. 1 : $b [A text-book] for students of botany and geology
Seward, A. C. (Albert Charles)
4,191 downloadsen2022The Expression of the Emotions in Man and Animals
Darwin, Charles
4,163 downloadsen1998Studies in the History and Method of Science, vol. 1 (of 2)
Unknown
4,123 downloadsen2014The reason why : $b a careful collection of many hundreds of reasons for things which, though generally believed, are imperfectly understood. A book of condensed scientific knowledge for the million
Philp, Robert Kemp
4,106 downloadsen2014The Origin of Species by Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition
Darwin, Charles
4,068 downloadsen1999The Cambridge natural history, Vol. 04 (of 10)
Smith, Geoffrey & Thompson, D'Arcy Wentworth & Warburton, Cecil & Weldon, Walter Frank Raphael & Woods, Henry
4,063 downloadsen2023Encyclopaedia Britannica, 11th Edition, "Echinoderma" to "Edward, prince of Wales" Volume 8, Slice 10
Various
4,027 downloadsen2011Charles Darwin: His Life Told in an Autobiographical Chapter, and in a Selected Series of His Published Letters
Darwin, Charles
3,917 downloadsen2012The Cambridge natural history, Vol. 06 (of 10)
Sharp, David
3,909 downloadsen2023Aristotle's History of Animals In Ten Books
Aristotle
3,892 downloadsen2019Encyclopaedia Britannica, 11th Edition, "Foraminifera" to "Fox, Edward" Volume 10, Slice 6
Various
3,888 downloadsen2011The life of Jean Henri Fabre, the entomologist, 1823-1910
Fabre, Augustin
3,884 downloadsen2024The Descent of Man and Selection in Relation to Sex, Vol. II (1st Edition)
Darwin, Charles
3,878 downloadsen2011The book of wonders : $b gives plain and simple answers to the thousands of everyday questions that are asked and which all should be able to, but cannot answer...
Unknown
3,849 downloadsen2025First course in biology
Bailey, L. H. (Liberty Hyde) & Coleman, Walter Moore
3,831 downloadsen2025Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part: Porulosa (Spumellaria and Acantharia) Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
Haeckel, Ernst
3,823 downloadsen2013Contributions to the Theory of Natural Selection A Series of Essays
Wallace, Alfred Russel
3,812 downloadsen2007The Voyage of the Beagle
Darwin, Charles
3,738 downloadsen1997Form and Function: A Contribution to the History of Animal Morphology
Russell, E. S. (Edward Stuart)
3,662 downloadsen2007Woman in Science With an Introductory Chapter on Woman's Long Struggle for Things of the Mind
Zahm, J. A. (John Augustine)
3,650 downloadsen2011Encyclopaedia Britannica, 11th Edition, "Ichthyology" to "Independence" Volume 14, Slice 3
Various
3,614 downloadsen2012History of Botany (1530-1860)
Sachs, Julius
3,609 downloadsen2020Fungi: Their Nature and Uses
Cooke, M. C. (Mordecai Cubitt)
3,598 downloadsen2009Cattle and Their Diseases Embracing Their History and Breeds, Crossing and Breeding, and Feeding and Management; with the Diseases to Which They Are Subject, and the Remedies Best Adapted to Their Cure
Jennings, Robert
3,537 downloadsen2007The grapes of New York
Hedrick, U. P.
3,530 downloadsen2014Darwin
Bradford, Gamaliel
3,503 downloadsen2023Snakes: Curiosities and Wonders of Serpent Life
Hopley, Catherine Cooper
3,486 downloadsen2016An Introduction to Entomology: Vol. 2 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
3,426 downloadsen2013The works of Francis Maitland Balfour, Volume 3 (of 4) : $b A treatise on comparative embryology: Vertebrata
Balfour, Francis M. (Francis Maitland)
3,422 downloadsen2014The Foundations of the Origin of Species Two Essays written in 1842 and 1844
Darwin, Charles
3,399 downloadsen2007Difficulty 56 (Graduate)The Sea and Its Living Wonders A Popular Account of the Marvels of the Deep and of the Progress of Martime Discovery from the Earliest Ages to the Present Time
Hartwig, G. (Georg)
3,396 downloadsen2020A handbook of systematic botany
Warming, Eugenius
3,386 downloadsen2022The Cambridge natural history, Vol. 10 (of 10)
Beddard, Frank E. (Frank Evers)
3,266 downloadsen2012The Variation of Animals and Plants Under Domestication, Volume II (of 2)
Darwin, Charles
3,234 downloadsen2009An Introduction to Entomology: Vol. 1 or Elements of the Natural History of the Insects
Kirby, William & Spence, William
3,206 downloadsen2013The Biotic Associations of Cockroaches
Roth, Louis M. (Louis Marcus) & Willis, Edwin R.
3,073 downloadsen2014Encyclopaedia Britannica, 11th Edition, "Matter" to "Mecklenburg" Volume 17, Slice 8
Various
3,034 downloadsen2013Toadstools, mushrooms, fungi, edible and poisonous; one thousand American fungi How to select and cook the edible; how to distinguish and avoid the poisonous, with full botanic descriptions. Toadstool poisons and their treatment, instructions to students, recipes for cooking, etc., etc.
McIlvaine, Charles & Macadam, Robert K.
3,004 downloadsen2016Flora of the Sudan
Broun, A. F. (Alfred Forbes) & Massey, R. E. (Reginald Ernest)
3,001 downloadsen2025Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part: Subclass Osculosa; Index Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII
Haeckel, Ernst
2,995 downloadsen2013Venoms: Venomous Animals and Antivenomous Serum-therapeutics
Calmette, A. (Albert)
2,991 downloadsen2016Eleanor Ormerod, LL. D., Economic Entomologist : Autobiography and Correspondence
Ormerod, Eleanor A. (Eleanor Anne)
2,976 downloadsen2020The flowering plants of Africa An analytical key to the genera of African phanerograms
Thonner, Franz
2,947 downloadsen2022Reptiles and Birds A Popular Account of Their Various Orders, With a Description of the Habits and Economy of the Most Interesting
Figuier, Louis
2,929 downloadsen2014The Vertebrate Skeleton
Reynolds, Sidney H. (Sidney Hugh)
2,922 downloadsen2013The Organism as a Whole, from a Physicochemical Viewpoint
Loeb, Jacques
2,920 downloadsen2014Cassell's Natural History, Vol. 3 (of 6)
Unknown
2,902 downloadsen2020A Guide to the Study of Fishes, Volume 2 (of 2)
Jordan, David Starr
2,884 downloadsen2016The Descent of Man and Selection in Relation to Sex, Vol. I
Darwin, Charles
2,880 downloadsen2011Letters of Asa Gray; Vol. 1
Gray, Asa
2,839 downloadsen2017The Cambridge natural history, Vol. 05 (of 10)
Sedgwick, Adam & Sharp, David & Sinclair, F. G. (Frederick Granville)
2,838 downloadsen2023Cassell's Natural History, Vol. 2 (of 6)
Unknown
2,825 downloadsen2019A text-book of veterinary anatomy
Sisson, Septimus
2,818 downloadsen2025The Natural History of the Varieties of Man
Latham, R. G. (Robert Gordon)
2,815 downloadsen2014The Journal of a Disappointed Man
Barbellion, W. N. P.
2,764 downloadsen2012Darwinism (1889) An exposition of the theory of natural selection, with some of its applications
Wallace, Alfred Russel
2,720 downloadsen2005The Naturalist on the River Amazons
Bates, Henry Walter
2,715 downloadsen2000The Plants of Michigan Simple Keys for the Identification of the Native Seed Plants of the State
Gleason, Henry A. (Henry Allan)
2,687 downloadsen2010Herbal Simples Approved for Modern Uses of Cure
Fernie, William Thomas
2,685 downloadsen2006The Nursery-Book: A Complete Guide to the Multiplication and Pollination of Plants
Bailey, L. H. (Liberty Hyde)
2,665 downloadsen2015The romance of natural history, second series
Gosse, Philip Henry
2,620 downloadsen2010Everyday Objects; Or, Picturesque Aspects of Natural History.
Adams, W. H. Davenport (William Henry Davenport)
2,611 downloadsen2014A History of North American Birds; Land Birds; Vol. 2 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
2,589 downloadsen2017The Descent of Man, and Selection in Relation to Sex
Darwin, Charles
2,588 downloadsen2000Narrative of the Circumnavigation of the Globe by the Austrian Frigate Novara, Volume II (Commodore B. Von Wullerstorf-Urbair,) Undertaken by Order of the Imperial Government in the Years 1857, 1858, & 1859, Under the Immediate Auspices of His I. and R. Highness the Archduke Ferdinand Maximilian, Commander-In-Chief of the Austrian Navy.
Scherzer, Karl, Ritter von
2,584 downloadsen2012The Cambridge natural history, Vol. 08 (of 10)
Gadow, Hans
2,576 downloadsen2024Himalayan Journals — Complete Or, Notes of a Naturalist in Bengal, the Sikkim and Nepal Himalayas, the Khasia Mountains, etc.
Hooker, Joseph Dalton
2,511 downloadsen2004Tobacco; Its History, Varieties, Culture, Manufacture and Commerce
Billings, E. R.
2,497 downloadsen2008Anatomy of the Cat
Reighard, Jacob & Jennings, H. S. (Herbert Spencer)
2,483 downloadsen2018The Evolution of Man
Haeckel, Ernst
2,478 downloadsen2005Journal of Researches into the Natural History and Geology of the Countries Visited During the Voyage Round the World of H.M.S. Beagle Under the Command of Captain Fitz Roy, R.N.
Darwin, Charles
2,474 downloadsen2003Evolution in Modern Thought
Unknown
2,468 downloadsen2007Scurvy, Past and Present
Hess, Alfred F.
2,468 downloadsen2012The Principles of Biology, Volume 1 (of 2)
Spencer, Herbert
2,438 downloadsen2017The plums of New York
Hedrick, U. P.
2,437 downloadsen2024Handbook of Medical Entomology
Riley, William A. (William Albert) & Johannsen, O. A. (Oskar Augustus)
2,434 downloadsen2010Life histories of North American shore birds, Part 1 (of 2)
Bent, Arthur Cleveland
2,432 downloadsen2014The Works of William Harvey M.D. Translated from the Latin with a life of the author
Harvey, William
2,429 downloadsen2019The pears of New York
Hedrick, U. P.
2,370 downloadsen2014Animal Behaviour
Morgan, C. Lloyd (Conwy Lloyd)
2,366 downloadsen2017The Medicinal Plants of the Philippines
Pardo de Tavera, T. H. (Trinidad Hermenegildo)
2,360 downloadsen2008The Taleef Shereef; Or, Indian Materia Medica
Unknown
2,347 downloadsen2016The Geological History of Plants
Dawson, John William, Sir
2,341 downloadsen2016The works of Francis Maitland Balfour, Volume 1 (of 4) : $b Separate memoirs
Balfour, Francis M. (Francis Maitland)
2,319 downloadsen2012Cave Hunting Researches on the evidence of caves respecting the early inhabitants of Europe
Dawkins, William Boyd
2,317 downloadsen2016Applied Eugenics
Popenoe, Paul & Johnson, Roswell H. (Roswell Hill)
2,311 downloadsen2006The Book of the Pearl The history, art, science, and industry of the queen of gems
Kunz, George Frederick & Stevenson, Charles Hugh
2,297 downloadsen2020The Ocean World: Being a Description of the Sea and Its Living Inhabitants.
Figuier, Louis
2,271 downloadsen2014Biographies of distinguished scientific men. First series
Arago, F. (François)
2,269 downloadsen2005Argentine Ornithology, Volume 1 (of 2) A descriptive catalogue of the birds of the Argentine Republic.
Sclater, Philip Lutley & Hudson, W. H. (William Henry)
2,268 downloadsen2012The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality
Schmid, Rudolf
2,263 downloadsen2007Difficulty 56 (Graduate)The Sea-beach at Ebb-tide A Guide to the Study of the Seaweeds and the Lower Animal Life Found Between Tide-marks
Arnold, Augusta Foote
2,261 downloadsen2013Observations of a Naturalist in the Pacific Between 1896 and 1899, Volume 2 Plant-Dispersal
Guppy, H. B. (Henry Brougham)
2,257 downloadsen2017A system of practical medicine. By American authors. Vol. 1 : $b Pathology and general diseases
Unknown
2,241 downloadsen2012The Moths of the British Isles, First Series Comprising the Families Sphingidæ to Noctuidæ
South, Richard
2,232 downloadsen2013A History of North American Birds; Land Birds; Vol. 1 of 3
Baird, Spencer Fullerton & Brewer, T. M. (Thomas Mayo) & Ridgway, Robert
2,228 downloadsen2017The Birds of Australia, Vol. 4 of 7
Gould, John
2,224 downloadsen2019The Cambridge natural history, Vol. 09 (of 10)
Evans, A. H. (Arthur Humble)
2,213 downloadsen2024Animal Life and Intelligence
Morgan, C. Lloyd (Conwy Lloyd)
2,200 downloadsen2015Elementary Zoology, Second Edition
Kellogg, Vernon L. (Vernon Lyman)
2,186 downloadsen2012Mental Evolution in Man: Origin of Human Faculty
Romanes, George John
2,185 downloadsen2015Insect Architecture
Rennie, James
2,180 downloadsen2014On the Genesis of Species
Mivart, St. George Jackson
2,177 downloadsen2007The Prolongation of Life: Optimistic Studies
Metchnikoff, Elie
2,169 downloadsen2016Lamarck, the Founder of Evolution: His Life and Work
Packard, A. S. (Alpheus Spring)
2,162 downloadsen2007The Story-book of Science
Fabre, Jean-Henri
2,156 downloadsen2018Australian insects
Froggatt, Walter W. (Walter Wilson)
2,150 downloadsen2025Histology of medicinal plants
Mansfield, William James
2,142 downloadsen2021Extinct Monsters A Popular Account of Some of the Larger Forms of Ancient Animal Life
Hutchinson, H. N. (Henry Neville)
2,133 downloadsen2013Island Life; Or, The Phenomena and Causes of Insular Faunas and Floras
Wallace, Alfred Russel
2,132 downloadsen2010Life histories of North American wood warblers, Part 1 (of 2)
Bent, Arthur Cleveland
2,129 downloadsen2012Parasites: A Treatise on the Entozoa of Man and Animals Including Some Account of the Ectozoa
Cobbold, T. Spencer (Thomas Spencer)
2,129 downloadsen2014Elementary Botany
Atkinson, George Francis
2,111 downloadsen2021Philosophical transactions, Vol. L. Part II. For the year 1758. Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.
Various & Royal Society (Great Britain)
2,110 downloadsen2022Fabre's Book of Insects
Fabre, Jean-Henri
2,107 downloadsen2021Essays Upon Heredity and Kindred Biological Problems Authorised Translation
Weismann, August
2,105 downloadsen2015A Guide to the Study of Fishes, Volume 1 (of 2)
Jordan, David Starr
2,104 downloadsen2014The Sea Shore
Furneaux, William S.
2,103 downloadsen2013Trees of Indiana First Revised Edition (Publication No. 13, Department of Conservation, State of Indiana)
Deam, Charles Clemon
2,033 downloadsen2012American Weasels
Hall, E. Raymond (Eugene Raymond)
2,031 downloadsen2013The Romance of Plant Life Interesting Descriptions of the Strange and Curious in the Plant World
Elliot, G. F. Scott (George Francis Scott)
2,019 downloadsen2014A Civic Biology, Presented in Problems
Hunter, George W. (George William)
1,992 downloadsen2012The Harvest of the Sea A contribution to the natural and economic history of the British food fishes
Bertram, James Glass
1,992 downloadsen2020The Progress of the Century
Unknown
1,976 downloadsen2017A Journey in Brazil
Agassiz, Louis & Agassiz, Elizabeth Cabot Cary
1,970 downloadsen2017Birds of the Rockies
Keyser, Leander S. (Leander Sylvester)
1,967 downloadsen2008Plants Poisonous to Live Stock
Long, Harold Cecil
1,946 downloadsen2020Argentine Ornithology, Volume 2 (of 2) A descriptive catalogue of the birds of the Argentine Republic.
Sclater, Philip Lutley & Hudson, W. H. (William Henry)
1,920 downloadsen2012The Dawn of Reason; or, Mental Traits in the Lower Animals
Weir, James, Jr.
1,910 downloadsen2007How to Use the Popular Science Library; History of Science; General Index
Serviss, Garrett Putman & Selwyn-Brown, Arthur
1,863 downloadsen2016The Science and Philosophy of the Organism
Driesch, Hans
1,829 downloadsen2013Alfred Russel Wallace: Letters and Reminiscences, Vol. 1
Wallace, Alfred Russel & Marchant, James, Sir
1,815 downloadsen2005The Industries of Animals
Houssay, Frédéric
1,756 downloadsen2009Life and Letters of Charles Darwin — Volume 2
Darwin, Charles
1,728 downloadsen2000Identification of the Larger Fungi
Watling, Roy
1,718 downloadsen2019Birds from North Borneo University of Kansas Publications, Museum of Natural History, Volume 17, No. 8, pp. 377-433, October 27, 1966
Thompson, Max C.
1,665 downloadsen2010An Elementary Study of Insects
Haseman, Leonard
1,580 downloadsen2007Sir Jagadis Chunder Bose, His Life and Speeches
Bose, Jagadis Chandra
1,496 downloadsen2007The Dog
Youatt, William
1,466 downloadsen2005Mysteries of Bee-keeping Explained
Quinby, M. (Moses)
1,413 downloadsen2008Rollo's Experiments
Abbott, Jacob
1,398 downloadsen2008Freedom in Science and Teaching. from the German of Ernst Haeckel
Haeckel, Ernst
1,109 downloadsen2008At the Deathbed of Darwinism: A Series of Papers
Dennert, Eberhard
1,016 downloadsen2007The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.
Eyre, J. W. H. (John William Henry)
961 downloadsen2009The Variation of Animals and Plants under Domestication
Darwin, Charles
926 downloadsen2002Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
Atkinson, George Francis
900 downloadsen2008Outlines of Dairy Bacteriology, 8th edition A Concise Manual for the Use of Students in Dairying
Russell, H. L. (Harry Luman)
880 downloadsen2009The Stock-Feeder's Manual the chemistry of food in relation to the breeding and feeding of live stock
Cameron, Charles Alexander, Sir
724 downloadsen2008Delineations of the Ox Tribe: The Natural History of Bulls, Bisons, and Buffaloes. Exhibiting all the Known Species and the More Remarkable Varieties of the Genus Bos.
Vasey, George
641 downloadsen2009The Genus Pinus
Shaw, George Russell
583 downloadsen2008Insects and Diseases A Popular Account of the Way in Which Insects may Spread or Cause some of our Common Diseases
Doane, Rennie Wilbur
570 downloadsen2009Man And His Ancestor: A Study In Evolution
Morris, Charles
557 downloadsen2009Are the Effects of Use and Disuse Inherited? An Examination of the View Held by Spencer and Darwin
Ball, W. P. (William Platt)
542 downloadsen2008Life and Matter: A Criticism of Professor Haeckel's "Riddle of the Universe"
Lodge, Oliver, Sir
507 downloadsen2008Species Plantarum, Sections IV-V
Linné, Carl von
433 downloadsla2008Zoölogische Philosophie Of beschouwingen over de Natuurlijke Historie der dieren etc.
Lamarck, Jean Baptiste Pierre Antoine de Monet de
419 downloadsnl2008Prof. Koch's Method to Cure Tuberculosis Popularly Treated
Birnbaum, Max
316 downloadsen2008