THE FUNDAMENTAL PHYSIOLOGICAL ACTIONS 29 



The name nudein has been given to a substance which is left be- 

 hind when the cell-protoplasm has been dissolved away by various 

 reagents : it is a nucleic acid compound and contains a considerable 

 quantity of phosphorus. In the living nucleus nuclein is combined 

 with various proteins to form nucleo proteins. 



The Fundamental Physiological Properties. All living animals 

 possess in greater or less degree the properties considered in this 

 chapter; and since the science of physiology is virtually concerned 

 with considering how these properties are acquired, maintained 

 and manifested, and for what ends they are employed, we may 

 call them the fundamental physiological properties. 



