ESTIMATION OF RED CORPUSCLES. 



143 



been drawn up to the figure i we should have a dilution 

 of i in 100, while if blood had been drawn up to the 

 figure 5 the dilution would be -5 in 100, or i in 200, and 



r 



so on. In the case of the other form of pipette the 

 dilution is read off directly from the figures on the lower 

 stem. 



The diluted blood thus obtained is spread out in a 

 film of a definite known thickness on the slide supplied 



