ALBUMINS. 107 



Classification of Proteids. The proteids are classified as 

 follows : 



{Serum-albumin. 

 Egg-albumin. 

 Lactalbumm. 

 Myo-albumin. 



Albuminates 



C Serum-globulin (paraglobulin). 



Fibrinogen. 

 ninki-.i; ne Paramyosinogen. 



VjrlODUlmS < Tkir 



j Myosmogen. 



Lactoglobulin. 

 |^ Crystallin. 



Nucleoproteids 



C Albumoses. 

 Globuloses. 



Proteoses Vitelloses. 



| Caseoses. 



(^ Myosinoses, etc. 



C Parapeptone. 



Peptones Propetone. 



| Hemipeptone. 

 [ Antipeptone, etc. 



( Fibrin. 

 Coagulated Proteids . . . < Myosin. 



( Casein. 

 Poisonous Proteids. 



ALBUMINS. 



These are sometimes described under the name of native 

 albumins. They are soluble in water, dilute saline solutions, and 

 saturated solutions of sodium chlorid and magnesium sulphate. 

 When their solutions are saturated with ammonium sulphate the 

 albumins are precipitated, and when heated to a temperature of 

 about 70 C. they are coagulated. It is important to distinguish 

 between precipitation and coagulation. As just stated, the albu- 

 mins are precipitated by ammonium sulphate ; but they still retain 

 their identity and solubility. When, however, they are coagulated 

 they become insoluble and are changed into a form known as 



