ESTIMATION OF RED CORPUSCLES. 143 
been drawn up to the figure 1 we should have a dilution 
of 1 in 100, while if blood had been drawn up to the 
figure 5 the dilution would be °5 in 100, or 1 in 200, and 
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Fic. 23.—Thoma’s Hemocytometer. 
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 
