226 ANIMAL INTELLIGENCE 
In both dog and cat the cortical centre of the brain 
for the fore-limb is readily excited by artificial stimu- 
lation; but this crude method and general result do 
not bring out the differences that the animal can by 
its own will accomplish, and serves, when taken with 
the facts of the animal’s actual life, only to show how 
very imperfect are our physiological imitations of will- 
power in these animals. 
None of our domestic animals has such power over 
the fore-limbs as the cat, and this is well established 
when the animal is even two months old. The develop- 
ment, as my diary shows, is very rapid when once it 
begins. 
And this is closely related to the play of the kitten. 
Play is especially instructive. The young animal 
has an excess of vital energy. Very soon this begins 
to express itself in imitative actions. I hope my 
diaries will furnish scope for comparison of the puppy 
and the kitten as regards play. Herein the animals 
differ widely, and reflect to perfection their psychic 
moods. 
The crouching, lying-in-wait, the concealment, of 
which I have made several records for the kitten, are 
only late and comparatively feebly developed in the 
dog—all of which is, of course, related to the manner 
in which the mature animal secures its prey in the 
wild state. 
The Canide hunt either alone or in packs, and rely 
on swiftness and concerted action. 
The Felide@ lie in wait, mostly alone or in pairs, and 
spring on their prey, so the kitten, when quite young, 
does not wait for a mouse to appear, but gives its 
instinct free scope in its attacks on flies, and if these 
be not forthcoming, it will, out of something, construct 
imaginary prey for its gratification. 
Again, the cat is very slow to develop, as my diary 
