8 GENERAL PROPERTIES OF LIVING TISSUES 



The muscle passes into the active state; it 

 shortens and thickens. The foot, which is rela- 



Fig. 3. The muscle clamp, stand, and nerve-holder. The nerve-holder 

 supports the sciatic nerve, together with the portion of the spinal column 

 from which it springs. The handle of the nerve-holder is of thick lead 

 wire which may be bent as desired. The binding post on the muscle clamp 

 provides electrical connection with the upper end of the 



i muscle. 



tively less fixed than the leg, is extended. The 

 contraction is followed by a slower relaxation or 

 return to the original form. 



