1. 1894The changes which take place in the skull, co-incident with the shortening of the face-axisProc. Acad. Nat. Sci., Phila., 181-183
2. On the Effects of Disease and Senility as Illustrated in the Bones and Teeth of Mammals
3. Aristotle Fourth Century B.C. De partibus animalium, Bk. II, Cap. 7.
4. Aristotle Historia animalium, Bk. I, Cap. 7; Bk. III, Capl. 5 and 7; Bk. VII, Cap. 10.