Experiments with Snails, Moths, and Beetles 149 
No. oF INDIVIDUALS Worms Cocoons 
é 70 black and striped yellow 
59 189 black and striped white 
gg {27 black yellow 
61 black white 
11 white yellow 
a 23 white white 
— | 39 striped yellow 
7 striped white 
Coutagne calls attention to the reappearance of the white char- 
acter-that is atavistic on his interpretation. It will be noticed 
in each group the numbers are nearly exactly halves, thus 70 
and 189, 27 and 61, 11 and 23, 39 and 77. 
Although it is not apparent that an application of the Mende- 
lian law is competent to explain all the results of these experi- 
ments, it is probable that some such rule lies behind several of the 
observed cases. Other cases clearly show blended inheritance, 
and still others show in some characters one kind and in others 
other kinds of inheritance. It is difficult in many cases to under- 
stand just what really occurs, but the results show plainly how 
complicated the problem of inheritance in a single group of 
forms may be. 
In a note published later, Coutagne compares his results with 
the Mendelian formula and points out that certain classes of his 
results conform to this law. It seems to me not improbable that 
if the latent qualities of some of the races be taken into consid- 
eration, the conformity may be greater than Coutagne admits. 
On the other hand, it appears probable that some characters do 
not dissociate according to the Mendelian expectation. 
A short paper by Toyama on Mendel’s law as applied to silk- 
worm crosses has very recently appeared, in which it is shown 
that many of the same characters studied by Coutagne give the 
Mendelian expectation. Unfortunately no reference is made to 
Coutagne, although a comparison would have been valuable. 
When moths of the Siamese breed, having either yellow or 
