CON x i 



Longitudinal Fibres of the Tegniental System. 



633. Cortical fibres, the optic radiation 991 



634. The superior peduncles of the cerebellum. The fillet. The longitu- 



dinal posterior bundle. Tracts from the corpora quadrigemina . 992 



Transverse or Commissural Fibres. 



The corpus callosum. The anterior white commissure. The fornix. 



The middle peduncles of the cerebellum ..... 994 

 636. A summary of some of the chief relations of the several parts of the 



brain to each other and to the spinal cord ..... 996 



SECTION IV. 



ON THE PHENOMENA EXHIBITED BY AN ANIMAL DEPRIVED OF ITS 

 CEREBRAL HEMISPHERES. 



637. The absence of distinct signs of volition and intelligence . . 999 



638. The characters of the movements of a brainless frog . . . 1000 

 639. The phenomena exhibited by birds after removal of their cerebral 



hemispheres ........... 1003 



640. The effects of removing the cerebral hemispheres in mammals . 1005 



641. The effects of removing the cerebral hemispheres in the dog . . 1006 



SECTION V. 

 THE MACHINERY OF COORDINATED MOVEMI 



642. The effects of injury to the semicircular canals. Our appreciation 



of the position of our body, the sense of equilibrium . . . 1009 

 643. Afferent impulses and sensations as factors of the coordination of 



movements ........... 1013 



644. The phenomena and causation of vertigo ...... 1015 



645. Forced movements .......... 1017 



646. The parts of the middle brain concerned in the coordination of 



movements ........... 1019 



SECTION VI. 

 ON SOME HISTOLOGICAL FEATURES OF THE BRAIN. 



647. The structure of the central grey matter and some other collections 



of grey matter ...... .... 1021 



648. The histology of the superficial grey matter of the cerebellum ; the 

 structure of the nuclear layer, molecular layer and of the cells of 

 Purkinj6 ........... 102*2 



649. The cerebral cortex. The general features of the grey matter; the 



pyramidal or other cells ........ 1026 



650. The layers of the grey matter ........ 1029 



651. The histological features of the parietal, occipital and frontal regions 1030 

 652. The probable significance of the structure of the cortex . . . 1032 



