by Elbert Hubbard
by F. (François) Arago
by Sarah Knowles Bolton
by James Montgomery , Mary Wollstonecraft Shelley
by James Montgomery , Mary Wollstonecraft Shelley
by John Burroughs
by James J. (James Joseph) Walsh
by James Montgomery , Mary Wollstonecraft Shelley
by Louis Agassiz
by Gaston Tissandier