86 4 PHYSIOLOGY 



BLOOD OF A MAN TWENTY-FIVE YEARS OF AGE. 



One thousand Grammes of Blood contain 

 513-02 Blood-corpuscles. 



Water . 



Substances not vapourising at 



349-69 



120 C 



Hsematin 



' Blood-casein,' &c. 



Inorganic constituents 



Chlorine . 

 Sulphuric acid 

 Phosphoric acid 

 Potassium 

 Sodium . 



Phosphate of lime . 

 Phosphate of magnesium 

 Oxygen . 



163-33 



7-70 



151-89 



3-74 



0-8981 



0-031 



0-695 



1-586 



0-241 



0-048 



0-031 



0-206 



486-98 Interstitial Fluid (Plasma). 

 Water . . ? . . . 439-02 

 Substances not vaporising at 



120 . . 47-96 



Fibrin . 



' Albumen,' &c. 



Inorganic constituents 



Chlorine. 

 Sulphuric acid 

 Phosphoric acid 

 Potassium 

 Sodium . 



Phosphate of lime . 

 Phosphate of magnesium 

 Oxygen . 



3-93 



39-89 



4-14 



1-722^ 



0-063 



0-071 



0-153 



1-661 



0-145 



0-106 



0-221 



(including 0-512 iron) 

 (excluding iron) 



Chloride of potassium 

 Sulphate of potassium 

 Phosphate of potassium . 

 Phosphate of sodium 

 Soda .... 

 Phosphate of lime 

 Phosphate of magnesium 



Total 



'Sulphate of potassium . 

 Chloride of potassium 

 Chloride of sodium 

 Phosphate of sodium 

 Soda . 



Phosphate of lime 

 Phosphate of magnesium 



Total 



1-887 

 0-068 

 1-202 

 0-325 

 0-175 

 0-048 

 0-031 



3-736 



0-137 

 0-175 

 2-701 

 0-132 

 0-746 

 0.145 

 0-106 



4-142 



Specific gravity = 1-0599 



THE PROTEINS OF THE PLASMA 



The plasma is generally described as containing a number of different 

 proteins belonging to the class of coagulable proteins. No albumoses or 

 peptones are present. Since the plasma in clotting gives rise to fibrin 

 and serum we may divide its protein constituents into those which are 

 the precursors of fibrin and those which are still contained in the serum. 



THE PRECURSORS OF FIBRIN. Most of these have been dealt with 

 in discussing the causation of coagulation. It only remains for us here 

 to mention some of the chemical features of fibrinogen and its product 

 fibrin. Fibrinogen is best separated by Hammarsten's method, namely, 

 half-saturation with sodium chloride, or by the use of ammonium sulphate. 

 Fibrinogen is precipitated between 13 and 28 per cent, saturation with 



