
by Ernst Haeckel

by Ernst Haeckel

by Calvin B. (Calvin Blackman) Bridges, Thomas Hunt Morgan

by Albert E. (Albert Edward) Winship

by William Bateson, Gregor Mendel

by George John Romanes

by M. L. (Martin Luther) Holbrook

by August Weismann

by Charles Benedict Davenport

by Furneaux Jordan

by August Weismann

by George John Romanes

by Thomas Hunt Morgan

by August Weismann

by George John Romanes

by W. P. (William Platt) Ball

by Ernst Haeckel

by George John Romanes

by William Bateson

by J. T. (Joseph Thomas) Cunningham