I 



f 



B 



f 







Fig. 38. 



A, Citrated blood as poured into centrifuge tube. B, Cells precipitated to the bottom of 

 the tube, clear serum and citrate solution above. Result of centrifugalizing A. C, Removal 

 of supernatant fluid. D, Test tube containing red cells after supernatant fluid has been 

 removed. 



