CHAPTER VIII.

THE FUNCTIONS OF THE BRAIN 91

General idea of nervous function, 91. The frog's nerve-centres, 92. The pigeon's nerve-centres, 96. What the hemispheres do, 97. The automaton-theory, 101. The localization of functions, 104. Brain and mind have analogous 'elements,' sensory and motor, 105. The motor zone, 106. Aphasia, 108. The visual region, 110. Mental blindness, 112. The auditory region, mental deafness, 113. Other centres, 116.