LIST OF ILLUSTRATIONS xxv 



Figure Page 



308. Gorilla. Level of the inferior colliculus 678 



309. Gorilla. Level of the superior colliculus 680 



310. Gorilla. Level of the optic chiasm 683 



311. Gorilla. Level of the anterior commissure 684 



312. Ventral surface of gray matter of brain stem, Troglodytes gorilla (co/or) .... 687 



313. Dorsal surface of gray matter of brain stem, Troglodytes gorilla (co/or) .... 689 



314. Lateral surface of gray matter of brain stem, Troglodytes gorilla (co/or) .... 691 

 315-318. Four extinct races of prehistoric man 732 



319. Prof. Osborn's estimates of man's antiquity, industries, arts and races 734 



320. Restoration of Pithecanthropus compared with human and anthropoid skulls . . 736 



321. Restorations of Heidelberg and Piltdown man by Professor McGregor 739 



322. The Neanderthal race 741 



323. The Cro-magnon race 742 



324. Stone implements representing the several stages of Paleolithic culture 744 



25. "Eoliths" from Piltdown, Sussex 746 



326. Contrasts between implements of the Paleolithic and Neolithic Ages 748 



327. Evolution of lance point through several stages of the Old Stone Age 750 



328. 329. Manufacturing flints 752, 753 



330. Implements and ornaments typical of Upper Paleolithic Age 755 



331. Australian native 768 



332. African pygmy group from the Belgian Congo 769 



333. African negro 770 



334. American Indian 772 



335. Eskimo 773 



336. Group of British scientists discussing the Piltdown skull 774 



337A and B. Dorsal surface of brain. Homo sapiens 780, 781 



338A and B. Base of brain. Homo sapiens 784, 785 



339A and B. Left lateral surface of brain. Homo sapiens 792, 793 



340. Ventral surface of brain stem. Homo sapiens 796 



341. Dorsal surface of brain stem. Homo sapiens 797 



342. Man. Level of the pyramidal decussation 801 



343. Man. Level of caudal extremity of dorsal sensory nuclei 805 



344. Man. Level of caudal extremity of inferior olivary nucleus 807 



345. Man. Level through middle of inferior olivary body 809 



346. 347. Man. Level of the vestibular nuclei 812, 813 



348. Man. Level of the cerebellar nuclei 816 



349. Man. Level of inferior portion of pons and emergence of sixth nerve 818 



350. Man. Level of the middle of the pons Varolii 821 



351. Man. Level showing the emergence of the fourth or trochlear nerve 825 



352,353. Man. Level of the inferior colliculus 828, 829 



354. Man. Level of the superior colliculus 831 



355. 356. Man. Level of the optic chiasm 833, 834 



357. Man. Level of the anterior commissure 835 



