Principles of Geology. Lyell.
Cassell’s Natural History, vol. ii.
Dental Anatomy. C. S. Tomes.
Natural History of America. Hill.
Wolf’s Life and Adventures.
Denman’s Travels.
Vulgar Errors, book iii. chap. i.
India, and Tiger Hunting. Barras.
American Naturalist, vol. v. pp. 606, 607.
Natural History of New York, vol. iv.