Abstract
The extremes of the gray and buff color phases of the deer-mouse, Peromyscus maniculatus blandus, behave in heredity as Mendelian allelomorphs, gray being recessive to buff. However, among the experimental animals several can not be assigned with certainty to either color phase, and in the series of specimens of wild animals there is an appearance of complete intergradation between the two color phases. Several inherited factors modifying color and pattern are shown to occur in the subspecies, and it is assumed that other unknown modifying factors mask in some individuals the clear expression of the color phases, and thus produce the apparent intermediates.
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