Experiments with Snails, Moths, and Beetles 147 
3,+4,+ 4, +75, which is the same as Galton’s law, but so far as 
I can interpret his data this is not strikingly apparent. Failing 
to carry the results discussed above through subsequent genera- 
tions leaves the matter in an unsatisfactory condition. In only 
one experiment is the result of the next generation given, which 
shows, if I interpret it correctly, that each of the four types 
gives, when inbred (?), individuals amongst which most of 
the same types reappear, but in very different proportions; the 
most striking result being that each type gives a much higher 
percentage of its own kind. 
(9) In the course of separation of two characters which takes 
place during a series of generations it happens at times that 
when two similar individuals are paired, z.e. both having the same 
character, the other contrasted character never appears again 
in their descendants. It has not simply become latent, but has 
gone entirely. 
It is obvious that this would happen, according to Mendel’s 
formula, whenever the individuals are pure dominants or pure 
recessives. 
(10) Crossing individuals with different characters often gives 
in the first generation a mixture, ‘‘mélange hétérogéne,” of two 
characters with marked predominance of one of them in the com- 
bination, and in this case it is easy, by means of selection in suc- 
cessive generations of the individuals having the most marked 
character, to fix rapidly this character and even to exaggerate 
its relation to the other. 
In cases of this sort it is not clear that Mendel’s law holds at 
all, and some other principle must be involved, especially if the 
author means that the results are obtained by simply discarding 
the individuals having the disappearing character and allowing 
the rest to breed together. 
(11) Crossing two individuals with a different character often 
gives in the first generation a separation of these characters in a 
part of the offspring and in the other part a union constituting 
a new character. Subsequent generations show a separation or 
liquidation of these characters. 
