No. 541] INHERITANCE OF COLOR IN CATTLE 11 



pigments of the offspring are due to either a simple Men- 

 delian mixture of various dilutions of parental pigments 

 with their resultant hypostatic effect, or to minor reaction 

 between the determiners presented by the two parents 

 resulting in modi lied pigment bodies. 



Harrington, Lee and Pearson's study of color in the 

 gray-hound — Biouict riha, 1904 — presents evidence that 

 might well be given sncli an interpretation. Their elabo- 

 rate tables measure accurately the correlation of the 

 color of ancestry and offspring in this animal, but they 

 do not explain what takes place in the zygote upon its 

 creation by the union of two somewhat differently 

 organized and differently descended gametes ; nor do they 

 clarify the conception of gametic organization. It is, 

 however, primarily a study in the mathematics, not the 

 chemistry, mechanism nor biology of inheritance. 



The black mane, tail and feet of the bay and of some 

 blue roan horses, and the white mane, tail and feet of the 

 chestnut Belgian seem to indicate that in horses the 

 whitening process may proceed somewhat out of synchro- 

 nism in its tissue and area sequences. The white mane 

 and tail seem to be causatively correlated with the chest- 

 nut coat of the Belgian, which white seems to be recessive 

 to the heavier pigments. Moreover, when the destroying 

 process attacks highly organized pigment bodies, is the 

 destruction always complete.' May there not be resting 



