CONTENTS. 



CHAPTER IV. 



THE BRAIN. 



PAGE 



Seat of sensibility and excitability in different parts of the encephalon Olfac- 

 tory ganglia Optic thalami Corpora striata Hemispheres Remarkable 

 cases of injury of hemispheres Effect of their removal Imperfect develop- 

 ment in idiots Aztec children Theory of phrenology Cerebellum Effect 

 of its injury or removal Comparative development in different classes 

 Tubercula quadrigemina Tuber annulare Medulla oblongata Three kinds 

 of reflex action in nervous system ..... 417-445 



CHAPTER V. 



THE CRANIAL NERVES. 



Olfactory nerves Optic nerves Auditory nerves Classification of cranial 

 nerves Motor nerves Sensitive nerves Motor oculi communis Patheti- 

 cus Motor externus Fifth pair Its sensibility Effect of division Influ- 

 ence on mastication Influence on the organ of sight Facial nerve Effect 

 of its paralysis Glosso-pharyngeal nerve Pneumogastric Its distribution 

 Influence on pharynx and oesophagus On larynx On lungs On stomach 

 and digestion Spinal accessory nerve Hypoglossal . . . 446-477 



CHAPTER VI. 



THE SPECIAL SENSES. 



General and special sensibility Sense of touch in the skin and mucous mem- 

 branes Nature of the special senses TASTE Apparatus of this sense Its 

 conditions Its resemblance to ordinary sensation Injury to the taste in 

 paralysis of the facial nerve SMELL Arrangement of nerves in nasal pas- 

 sages Conditions of this sense Distinction between odors and irritating 

 vapors SIGHT Structure of the eyeball Special sensibility of the retina 

 Action of the lens Of the iris Combined action of two eyes Vivid nature 

 of the visual impressions HEARING Auditory apparatus Action of mem- 

 brana tympani Of chain of bones Of their muscles Appreciation of the 

 direction of sound Analogies of hearing with ordinary sensation . 478-513 



CHAPTER VII. 



SYSTEM OP THE GREAT SYMPATHETIC. 



Ganglia of the great sympathetic Distribution of its nerves Sensibility and 

 excitability of sympathetic Sluggish action of this nerve Influence over 

 organs of special sense Elevation of temperature after division of sympa- 

 thetic Contraction of pupil following the same operation Reflex actions 

 taking place through the great sympathetic .... 514-524 



