by John Harvey Kellogg
by Otto Weininger
by Mary Marcy, R. B. (Roscoe Burdette) Tobias
by Anonymous
by Havelock Ellis
by Otto Weininger
by Mary Wood-Allen
by B. G. (Benjamin Grant) Jefferis, J. L. (James Lawrence) Nichols
by Hans Fehlinger
by Havelock Ellis
by B. G. (Benjamin Grant) Jefferis, J. L. (James Lawrence) Nichols
by Emanuel Swedenborg
by A. Maude (Agnes Maude) Royden
by Mary Scharlieb, Frederick Arthur Sibly
by Sylvanus Stall
by Auguste Forel
by Denis Diderot
by H. W. (Harland William) Long
by Edward Carpenter
by Horatio Robinson Storer
by Mary Wood-Allen
by Edward Carpenter
by Henry Clarke Wright
by Otterbein Oscar Smith
by Henry N. (Henry Newell) Guernsey
by Mary Wood-Allen
by Viscount Bertrand Edward Dawson Dawson
by Horatio Robinson Storer
by Kenneth Ingram
by Ellice Hopkins
by E. B. (Edith Belle) Lowry
by Elizabeth Blackwell
by Charles Francis Adams
by Elizabeth Blackwell
by J. B. (Jean Baptiste) Bouvier
by Felix Ortt