Archegosaurus, [135].

Archeopteryx, [73].

Arcturus, [193].

Argyll, Duke of, [14], [276].

Aristotle, [288].

Armadillo, extinct kind, [110].

Arthritis, rheumatic, [183].

Artiodactyle foot, [109].

Asa Gray, Dr., [253], [255], [261].

Asceticism, [193].