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MAMMALIAN ANATOMY 
showing that its specific gravity is equal to that of the mixture. 
If, on the other hand, the drop of blood floats add benzol gradually 
and stir the mixture in the same way until a mixture is obtained 
in which the blood will remain suspended at any level. Then 
pour the mixture into a tall cylinder and determine its specific 
gravity with the hydrometer. This will also be the specific 
gravity of the blood. In returning the mixture to the stock bottle, 
remove the blood by straining. Record your method of procedure 
and the result of the determination. 
4. Determination of the Percentage of Haemoglobin in a Sample 
of Blood by Means of Some Form of Haemoglobinometer. 1 
Follow carefully the directions for using this device. Record 
the percentage determined. 
1 The Tallquist hemoglobin scale is a convenient form for this work. 
1 
