CATS THAT HAVE LOST AVERSION TO WADING AND SWIMMING. 67 
be coincident. It therefore follows that in the lower forms of animal 
life the partition and election is largely coincident, while in the case 
of the higher animals, and especially with man, the powers of accom- 
modation being the leading factors, the isolation and selection are 
largely coincident. 
_ Industrial partition brings together, in the mining regions of Colo- 
rado, a peculiar type of people, gathered together from many regions 
where the opportunities for exercising their special training are not as 
great as in this frontier mining region. But this industrial partition 
introduces and determines industrial isolation, for it inevitably leads 
to the segregate propagation of the peculiar type brought together in 
these mining regions; and this industrial isolation thus produced is 
an example of coincident isolation. 
Active (or endonomic) influences are due to the fact that the 
species may use alternative methods. The number of alternative 
methods of dealing with the environment rests upon the variety of 
possible choices open to the different sections of a species; and this is 
determined by the variety of innate aptitudes and of acquired habi- 
tudes, and of new discriminative experiments that the species can 
furnish. 
Coincident influences are due to the fact that adaptive variations 
and accommodations may codperate in dealing with conditions in 
a harmonious way. When variation with adaptation prepares the 
way for and controls innovation with accommodation, we have 
coincident partition and election. When innovation with accommo- 
dation prepares the way for and controls variation with adaptation, 
we have coincident isolation and selection. 
13 A Colony of Cats that have lost Aversion to Wading and Swimming. 
The interaction of the principles of segregation is allustrated by the 
Tarpon Island cats. One of the most decided instincts of the ordinary 
cat is to avoid immersion in water or any other liquid. His inherited 
nature leads him to dislike to wet even his feet; but there may arise 
conditions under which he will use his paws in drawing food out of the 
water. More than one has learned to help himself to cream placed in 
an open jar by thrusting his paw into the liquid and then licking off 
what adheres. Some have learned to skim pans of milk in a similar 
way, and others have become adepts in fishing for goldfish kept in 
glass globes or aquaria. These undoubted examples of the partial 
overcoming of their natural aversion renders it easier to believe the 
following account of a complete change of habits in a certain isolated 
group of cats. 
