GENERAL OBSERVATIONS. 



15 



Of the Properties Independent of Life. . 



Q. What are they termed? 

 A. Properties of texture. 

 Q. What are they? 



/?. Extensibility and contractility of texture. 

 Q. What do you mean by the horny hardening? 

 /?. It is a form of contractility which parts undergo 

 after death, on exposure to heat, acids, &c. 



Q. How many kinds of horny hardening are there? 

 #. Two; the sudden and slow. The first is produced 

 by fire and acids; the second by neutral salts, air, alcohol, 

 &c. 



Q. What textures are not susceptible of the sudden 

 horny hardening? 



#. The hair, epidermis, and nails. 

 Q. What textures are most susceptible of it? 

 #. The fibrous, muscles, tendons, and nerves. 

 Q. What state is incompatible with slow horny hard- 

 ening? 



Ji. It cannot take place during life, but the sudden 

 may, as you see in burns. 



Q. What destroys both kinds of this hardening? 

 #. Putrefaction of the texture. 

 Q. How many kinds of contractility are there? 

 A. Five. 



Q. What do you understand by animal contractility? 

 */i. The influence of the nerves on the voluntary mus- 

 cles. 



Q. What is meant by sensible organic contractility? 

 #. The action of the involuntary muscles from stimuli 



