126 Hemoglobin Determination 
capacity of the blood. The first ten blood samples of a large 
series were chosen and illustrate the error in estimation which 
may be expected. Except in blood Sample 6, no variation between 
the colorimetric determination (Dubosceq) and the oxygen capacity 
method is greater than 1.0 per cent. 
Advantages.—(1) Single determinations may be carried through 
in 2 minutes. (2) An accuracy within 1 per cent is easily ob- 
tained. (3) The standard solution is easily and adequately con- 
trolled. (4) Similar solutions are used for comparison, making 
the color fields, within the limits of the colorimeter, identical. 
(5) The apparatus required is found in any well equipped 
laboratory. 
SUMMARY. 
A method for the determination of hemoglobin colorimetrically 
with an accuracy of 1 per cent is described. 
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