TRANSMISSION OF MALFORMATIONS. 193 
the hare. Thus the cleft nose in the pug (fig. 101) is due 
to the non-union of the globular processes. It is a fact 
of some interest that in the embryos of some kanga- 
roos (Macropus) the fissures in the lips persist longer 
than in any other mammals I have yet had an oppor- 
tunity of examining. 
These facts concerning the transmissibility of defects 
in the dog’s nose tend to show that it is probable, if it 
were possible to practise selective breeding in the human 
species as among dogs, a race of men with hare-lips and 
cleft-palates could be produced, and this view is further 
strengthened by the knowledge that in some districts 
where the inhabitants are not very numerous a sort of 
indirect selection goes on with the effect of perpetuating 
deformities. 
_ An excellent example of this is given by Professor 
Bertram Windle in a paper on “ Congenital Malforma- 
tions and Heredity.” He remarks that a singular 
account, given by Devay on the authority of Dr. A. 
Potton, seems to show that under favourable circum- 
stances, continued for a sufficient length of time, a 
separate breed of men, possessed of some malformation, 
might be produced, whilst it also shows that the insta- 
bility of such a condition, which must persist for some 
time, leads to its being easily stamped out by the 
introduction of fresh and untainted blood. 
In the department of Isere not far from Cdte-Saint- 
André and Rives, there is a small isolated village called 
Izeaux, lost, so to speak, in the midst of a plain, called 
the plain of Bievre, which, if not completely unculti- 
vated, was at least very barren. The roads were difficult, 
14 
