454 PROTEINS 



such analyses include not only the dead protoplasm but also 

 substances mixed with the protoplasmic matrix but not neces- 

 sarily forming an integral part of the protoplasm. Further, 

 chemical analyses can only identify the more stable substances ; 

 there is no technique available to enable the identification of 

 transient substances, the recognition of which would go far 

 to solve many physiological problems. 



FURTHER REFERENCES. 



Abderhalden : " Lehrbuch der physiologischen Chemie," Berlin, 1909. 

 Cathcart : " The Physiology of Protein Metabolism," London, 191 2. 

 Cohnheim : " Chemie der Eiweisskorper," Braunschweig, 1911. 

 Fischer : " Untersuchungen iiber Aminosaiiren, Polypeptide und 

 Proteine," Berlin, 1906. 



Levene : " Hexosamines and Mucoproteins," London, 1925. 

 Plimmer : " The Chemical Constitution of the Proteins," London, 1917. 

 Schryver : " The General Characters of the Proteins," London, 1909. 



