DERMOID SYSTEM. 299 



Q. In cases of dermoid extension, is the chorion ren- 

 dered thinner? 



Jl. It is in almost every case. 



2. Vital Properties. 



Q. What property of animal life is most conspicuous 

 in the $ikin? 



e/2. Above all others, animal sensibility. 



Q. What functions does this property govern? 



#. Those of feeling and of touch. 



Q. In what does feeling differ from touch? 



t#. Feeling perceives the impression and general mo- 

 difications of surrounding bodies; touch ascertains the spe- 

 cial modifications of those bodies, as to form, dimensions, 

 &c. 



Q. In what does touch differ from other senses? 



#. Touch requires no peculiar modification of sensi- 

 bility; the eye, the ear, the organ of smelling, all require 

 this peculiarity of sensibility. The touch is exercised on 

 the qualities of bodies emphatically tangible, and not on 

 their colour, flavour, and such like qualities. The touch is 

 exercised from voluntary impulse; it is not so with the 

 other senses. Touch is an operation somewhat consequen- 

 tial to the action ofHhe other senses. All the other senses 

 require not only peculiar sensibility, but a peculiarity of 

 structure; whereas accurate touch only requires form con- 

 venient for exposing surfaces of contact; such form is seen 

 in the hand of man. 



Q. What part of the dermoid texture belongs to animal 

 life, and what to organic life? 



,*#. The papillae are governed by animal sensibility. 



