166 PHYSIOLOGY. 



is an internal? What an external sensation? What are ideas? 

 What is the office of the senses ? How many external senses are there ? 

 Are they under the control of the will ? What is touch ? Is touch the 

 same as feeling ? Of how many layers is the skin composed ? What 

 is the cuticle ? How formed ? Its use ? Is it subjected to the same 

 law as the other parts of the body are in relation to pressure? What 

 would have been the consequence ? Describe the mucous web. The 

 true skin. Where is the sense of touch chiefly situated ? Describe the 

 papilla?. What is the pulp of the fingers chiefly composed of? Can 

 the blind distinguish colours by the touch ?'/How is this explained? 

 Why is the external surface endowed with special sensibility ? What 

 does Majendie say of the human skin ? By what process are the blind 

 enabled to read ? What cases show that the possession of a hand is not 

 necessary for the display of intellect and ingenuity ? What is the or- 

 gan of touch in animals ? in insects ? What senses are liable to illu- 

 sions ? Which is the most certain of the senses ? What fact was 

 established by the senses of hearing, sight, and touch ? Is the touch 

 ever liable to error ;?Vln what cases? May the sense of feeling be- 

 come blunted ? What facts prove it ? Are the tactile powers of the 

 skin in proportion to its sensibility ? 



