Abstract
In connection with some biochemical studies on heredity now in progress in this laboratory we desire to record certain results regarding the refractive index of the blood serum of a genus-hybrid produced from the mating Cornish Indian Game 
X Guinea Fowl 
. The measurements were made with a Zeiss Eintauch Refraktometer on the unmodified serum of freshly drawn blood, expressed from the clot by centrifugation.
Our results show that (1) there is a definite, characteristic, and permanent difference between the refractive index of the serum of the fowl and that of the guinea; and (2) that in the hybrid the guinea parent is dominant in respect of the physico-chemical constitution of the blood as measured by the refractive index. Some figures on the point follow:
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