COMPOSITION OF BLOOD. 69 



Average proportions of all the constituents of the blood 

 in i,OOO parts: 



Water 784' 



Albumen. . ....... 70* 



Fibrin 2'2 



Ked corpuscles (dry) 130* 



Fatty matters I '4 



Inorganic salts : Chloride of sodium . . . 3 *6 



Chloride of potassium . . . 0-35 



Tribasic phosphate of soda . . 0*2 



Carbonate of soda . . . . 0-28 



Sulphate of soda . . . . 0*28 



Phosphates of lime and magnesia . 0-25 



Oxide and phosphate of iron . 0*5 

 Extractive matters, biliary colouring matter, gase.3, 



and accidental substances . . . . 6 '40 



Elementary composition of the dried blood of the ox : 



Carbon . . . . . . . 57'9 



Hydrogen . . . . . . . . 7*1 



Nitrogen . . . . . . 17 "4 



Oxygen 19*2 



Ashes 4-4 



These results of the ultimate analysis of ox's blood afford 

 a remarkable illustration of its general purpose, as supply- 

 ing the materials for the renovation of all the tissues. For 

 the analysts (Play fair and Boeckmann) have found that 

 the flesh of the ox yields the same elements in so nearly 

 the same proportions, that the elementary composition of 

 the organic constituents of the blood and flesh may be con- 

 sidered identical, and may be represented for both by the 

 formula C 45 H 39 N 6 O 15 . 



The Blood-Corpuscles or Blood-Cells.] 



It has been already said, that the clot of blood contains, 

 with the fibrin and the portion of the serum that is soaked 

 in it, the blood-corpuscles, or blood-cells. Of these there are 



