QUANTITATIVE DILUTION METHOD 



53 



imate this amount in the preparation of the diluting fluid, 

 e.g., in obtaining a quantitative estimation of the micro- 



FIG. 15. Incubator. 



organisms from the blood, dilutions should be made in 0.85% 

 salt solution; from tap water, in tap water, etc. 



Theoretically, dilutions made in a liquid of a markedly 

 different electrolyte concentration from that of the sub 



