by Thomas R. (Thomas Robert) Henry
by Charles Darwin
by Jean-Henri Fabre
by Arthur Mangin
by Erasmus Darwin
by comte de Georges Louis Leclerc Buffon
by W. Hamilton (William Hamilton) Gibson
by Jules Michelet
by Jules Michelet
by Richard Jefferies
by J. G. (John George) Wood
by Sir E. Ray (Edwin Ray) Lankester
by comte de Georges Louis Leclerc Buffon
by Philip Henry Gosse
by Alfred Edmund Brehm
by Jules Michelet
by New York State College of Agriculture
by W. Hamilton (William Hamilton) Gibson
by Sir E. Ray (Edwin Ray) Lankester
by Sir John Lubbock
by comte de Georges Louis Leclerc Buffon
by W. H. Davenport (William Henry Davenport) Adams
by Charles Darwin
by comte de Georges Louis Leclerc Buffon
by Alphonse Karr
by comte de Georges Louis Leclerc Buffon
by Sir Francis Darwin
by Sir E. Ray (Edwin Ray) Lankester
by Edward Hamilton Aitken
by Sir E. Ray (Edwin Ray) Lankester
by Mary Somerville
by Frederick Leroy Sargent, Mary Treat, Samuel Wells
by comte de Georges Louis Leclerc Buffon
by comte de Georges Louis Leclerc Buffon
by Samuel Scoville
by Alfred Edmund Brehm
by Thomas G. (Thomas George) Gentry
by comte de Georges Louis Leclerc Buffon
by Charles Kingsley
by comte de Georges Louis Leclerc Buffon
by William Bingley
by Grant Allen
by Nellie Lathrop Helm, Francis W. (Francis Wayland) Parker
by comte de Georges Louis Leclerc Buffon
by G. (Georg) Hartwig
by William Bingley
by James Russell Lowell
by Alfred Edmund Brehm
by Sir E. Ray (Edwin Ray) Lankester
by Wilhelm Bölsche
by Royal Society (Great Britain)
by William Bingley
by Lorenz Oken
by Mary Somerville
by Ernst Haeckel
by Geertruida Carelsen
by John D. (John Davidson) Godman