THE BLOOD. 



151 



blood. (3) A third way is to mix frog's blood with an equal part of a 5$ of 

 cane sugar, and to get rid of the corpuscles by filtration ; or (4) by the injec- 

 tion of commercial peptone into the veins of certain mammals, previous to 

 bleeding them to death, allowing the corpuscles to subside, and afterward 

 subjecting the supernatant plasma to the action of a centrifugal machine ; by 



Fig. 133. Plan and section of centrifugal machine. A, An iron socket secured to top of table B; 

 c, a steel spindle carrying the turntable D, and turning freely in A ; E, a flange round turntable D; 

 F F, shallow grooves on face of D, in which the test tubes are fixed by clamp^ G G; H, a pulley fixed 

 to end of spindle c, and turned by the cord K; 1 1 are two guide-pulleys for cord K. (Gamgee.) 



the rapid rotation of which (fig. 133) the whole of the remaining solid parti- 

 cles, if any, is driven to the outer end of the test-tubes in which the plasma is 

 placed. 



Composition of Plasma. 



Water . . ->} 

 Solids 



Proteids : 



1. Yield of fibrin 



2. Other proteids . 

 Extractives including fat . 

 Inorganic salts 



4.05 



78.84 

 5.66 

 8 5 



902.9 



97.1 



1000 



