THE CHEMISTRY OF THE ANIMAL BODY. 1017 



after heating with concentrated hydrochloric acid, forming a violet-colored 

 solution (Liebermann). 



The following, taken in part from Chittenden, 1 is submitted as a general 

 classification of the proteids : 



SIMPLE PROTEIDS. 

 r Serum-albumin ; 



Egg-albumin ; 



Albumins < .' 



Lacto-alburmn ; 



I Myo-albumin. 

 Serum-globulin ; 

 Fibrinogen ; 



Globulins 



Myosin ; 



Myo-globulin ; 

 Paramyosinogen ; 

 Cell-globulin. 



Albuminatest Acid-albamin j 

 I. Alkali-albumin. 



Proteases and Peptones. 



Coagulated Proteids { Fibrin ; 



I Other coagulated proteids. 



COMBINED PROTEIDS. 

 r Haemoglobin ; 



Histo-hsematins ; 



Chromo-proteids ^ Chlorocruorin ; 

 Hsemerythrin ; 

 Hsemocyanin. 



m 2 - j f Mucins ; 



Glyeo-proteids < 



\ Mucoids. 



f Casein ; 

 x 1. Those yielding para-nuclein < Pyi'n ; 



Nudeo-proteids \ ^ Vitellin. 



I o rpi .1-,. i f Nucleo-histon : 



v 2. Those yielding true nuclein <-,-.. , . 



1 Cell-nuclem. 



Phospho-glyco-proteids. Helico-proteid. 



ALBUMINOIDS. 

 Collagen (gelatin). 

 Elastin. 

 Keratin and Neurokeratin. 



Albumins. Bodies of this group are soluble in water and precipitated by boiling, or 

 on standing with alcohol. Serum-albumin is the principal proteid constituent of blood- 

 plasma, while lacto-albumin and myo-albumin are similar bodies found respectively in 

 milk and muscle. 



1 "Digestive Proteolysis," Carturight Lectures, 1895, p. 30. 



