BLOOD. 



51 



One interesting fact brought out in the above table is the peculiarity in 



distribution of the potassium and sodium salts between the plasma and the 

 corpuscles. The plasma contains an excess of the total sodium salts, and the 

 corpuscles contain an excess of the potassium salts. 



Composition of Blood-plasma (1000 parts). 



Water 



Solids . 



Total proteids 



Fibrin (derived from the fibrinogen 



Paraglobidin 



Serum-albumin 



Extractives and salts 



Horse. 



917.6 

 82.4 

 69.5 

 6.5 

 38.4 

 24.6 

 12.9 



Composition of Blood-serum (1000 parts). 1 



Horse. 



85.97 

 72.57 



45.65 

 26.92 

 13.40 



Man. 



92.07 

 76.20 



31.04 

 45.16 



15.88 



Ox. 



89.65 

 74.99 



41.69 

 33.30 

 14.66 



Bed Corpuscles, Human Blood (Hoppe-Seyler). 



I. II. 



Oxyhemoglobin 86.8 94.3 per cent. 



Proteid (and nuclein ?) 12.2 5.1 



Lecithin 0.7 0.4 " 



Cbolesterin 0.3 0.3 " 



Leucocytes, Thymus of Calf (Lilienfeld). 

 In the 'total dry substance of the corpuscles, which was equal to 11.49 per cent., there were contained — 



Proteid 1.76 per cent. 



Leuco-nuclein 68.78 " 



Histon 8.67 



Lecithin 7.51 " 



Fat 4.02 " 



Cholesterin 4.40 " 



Glycogen 0.S0 " 



The extractives present in the blood vary in amount under different conditions. 

 Average estimates of some of them, given in percentages of the entire blood, 

 have been reported as follows : 



Dextrose (grape-sugar) 0.117 percent. 



Urea 0.016 



Lecithin 0.0844 " 



Cholesterin 0.041 " 



Proteids of the Blood-plasma. — The properties and reactions of proteids 

 and the related compounds, as well as a classification of those occurring in t lie 

 animal body, are described in the section on the Chemistry of the Body. 

 This description should be read before attempting to study the proteids of 

 the plasma and the part they take in coagulation. Three proteids are usually 

 described as existing in the plasma of circulating blood — namely, fibrinogen, 

 paraglobulih, or, as it is sometimes called, "serum-globulin," and serum-albu- 

 min. The first two of these proteids, fibrinogen and paraglobidin, belong to 

 the group of globulins, and hence have many properties in common. Serum- 

 albumin belongs to the group of so-called ''native albumins" of which egg- 

 albumin constitutes another member. 



1 Haramarsten : .1 Text-book of Physiological Chemistry, 1898 [translated by Mandel). 



