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