
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