Ape's sexual characters, [49].

Apostles' Creed, [245].

Appendages of lobster, [161].

Appendages of Normandy pigs, [99].

Appendages of turkey, [100].

Appendix, vermiform, [83].

Appreciation of Mr. Darwin, [10].

Apteryx, [7], [70].

Aqueous humour, [76].

Aquinas, St. Thomas, [17], [263], [265].