Vlll CONTENTS 



CHAP. PAGE 



XXIII. PERFUSION OF VESSELS. LYMPH-HEARTS . . . 100 



XXIV. MECHANISM OF SECRETION ...... 103 



XXV. RESPIRATION ....... 106 



XXVI. NERVE-ROOTS . . . . . . .110 



XXVII. REFLEX ACTION AND REACTION TIME. EXCITATION OF CORTEX 



CEREBRI . . . . . . .111 



XXVIII. CUTANEOUS SENSATIONS . . . . . .116 



XXIX. EXPERIMENTS ON THE DIOPTRIC MECHANISM . . .118 



XXX. STIMULATION OF THE RETINA . . . , . 122 



XXXI. THE PRODUCTION OF VOCAL SOUNDS. ANALYSIS OF SOUNDS. 



AUDITION. SEMICIRCULAR CANALS .... 125 



XXXII. TASTE AND SMELL . 128 



