T.TST 01" III rSTRATIONS xiil 



Figure Page 



308. Gorilla. Lc\cl ol tlic inferior colliculus 6~8 



309. Gorilla. Level of the superior colliculus 680 



310. Gorilla. Level of the optic chiasm 685 



311. Gorilla. Lo\cl of the anterior commissure 684 



312. \'entral surface of gray matter of brain stem, Troglodytes gorilla (fo/or) .... 687 



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



314. Lateral surface of gra\niatter of brain stem. Troglodytes gorilla (co/or) .... 691 

 315-318. Four extinct races of prehistoric man -32 



319. Prof. Osborn's estimates of man's antiquity, industries, arts and races "34 



320. Restoration of Pithecanthropus compared with human and anthropoid skulls. . "36 



321. Restorations of Heidelberg and Piltdown man by Professor McGregor "39 



322. The Neanderthal race -41 



323. The Cro-magnon race -42 



324. Stone implenu'nts representing the se\eral stages of Paleolithic culture 744 



325. "I-.oliths" from Piltdown, Sussex "46 



326. Contrasts between implements of the Paleolithic and Neolithic Ages "48 



32". Evolution of lance point through se\eral stages of the Old Stone Age 750 



328, 329. Manufacturing Hints 752, ■'53 



330. I ni|)lenK'nts and ornaments typical of Upper Paleolithic Age 755 



331. Australian nati\e -68 



332. African pygn:y group irom the Belgian Congo 769 



333. African negro 770 



334. American Lidian — 2 



335. Eskimo ~3 



336. Group of British scientists discussing the Piltdown skull 7-4 



33-.\ and b. Dorsal surface of brain, Homo sapiens -80, -81 



338.\ and b. Base of brain. Homo sapiens ■. . -84, -85 



339.\ and B. Left lateral surface of brain. Homo sapiens -92, -93 



340. Ventral surface of brain stem. Homo sapiens -96 



341. Dorsal surface of brain stem. Homo sapiens 797 



342. Man. Le\cl of the p\ ramidal decussation 801 



343. .Man. Le\ el of caudal extremity of dorsal sensory nuclei 805 



344. .Man. Level of caudal extremity of inferior olivary nucleus 80" 



345. .Man. Le\i-1 through middle of inferior oli\ary body 809 



346,34-. .Man. Lc\el 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. ALin. Le\el of the middle of the pons Varolii 821 



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



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



354. Man. Level of the superior colliculus • 831 



355. 35^- ^Lin. Level of the optic chiasm 833, 834 



3-;-. .\L'in. Level of the anterior commissure 835 



