1. A contribution to the history of the germ-layers in clepsine Author(s): Whitman, Charles Otis, 1842-1910, author Publication: Boston : Ginn and Company, [1887?] Subject(s): Leeches -- cytologyGerm Layers -- cytology
2. Spermataphores as a means of hypodermic impregnation Author(s): Whitman, Charles Otis, 1842-1910, author Publication: Boston : Ginn & Company, 1891 Subject(s): SpermatogoniaLeeches -- cytologyReproductive Behavior -- physiology
