No. 575] SHORTER ARTICLES AND DISCUSSION 699 



'portance of the latter in connection with the survival of new 

 races. Thus he writes : 4 



The quadroon child of the mulatto and the white has a quarter tint ; 

 some of the children may be altogether darker or lighter than the rest, 

 but they are not piebald. 3 Skin-color is therefore a good example of 

 what I call blended inheritance. . . . 



Next as regards heritages that come altogether from one progenitor to 

 the exclusion of the rest. Eye-color is a fairly good illustration of 



There are probably no heritages that perfectly blend or that abso- 



the other direction, and the tendency is often a very strong one. 

 On the following page Galton remarks that 



A peculiar interest attaches itself to mutually exclusive heritages, 

 owing to the aid they must afford to the establishment of incipient races. 



He thus recognizes the invalidity of Darwin's objection to 

 "single variations" as a factor in evolution, namely, that they 

 would certainly be swamped by crossing with the general popu- 



It would, therefore, appear that in his recognition of continu- 

 ity as well as discontinuity both in variation and heredity. Walton 

 was in advance of his time, and more in accord with some of the 

 current views. R. Ruggles Gates 



REPULSION IN MICE 

 In the February number of the American Naturalist Dr. C. 

 Little criticizes the results of my mouse-breeding experiments 

 which I published in the Zeitschrift fur Induktive Abstam- 

 mioujs- und Ycnrbungs-hhre Bd. VI. Heft 3. The chief point, 



I obtained in breeding black and albino mice together. 



The fact is, that in my paper on mice, I overlooked a serious 

 error. In three sentences on page 126, relating to test matings 

 of albinos, the words ' ' black " and 1 ' agouti ' ' changed places. As 

 printed in the paper these sentences run: 



Without exception they have given black or equal numbers of black 

 and albino young, depending upon the purity of the black used. But 

 never has one of these albinos produced a single agouti young in a mat- 

 ing with black. Counting together the colored young of such families I 

 get 89 black young. 



