224 ANIMAL INTELLIGENCE 
motor activity. The tail movements and carriage are 
definitely related to the character of the animals, and 
to those that watch them closely express distinct and 
varying phases of emotion, etc. 
The antipathy of the cat to the dog, while related to 
a psychic state, based on self-preservation from intruders, 
is peculiarly marked towards the dog, though whether 
more so than towards any other similar animal, or, 
towards, say a large part of the animals that might be 
found in any menagerie, is one that I have not investi- 
gated. I have been very much impressed by the fact, 
that at an early age the kitten, when suddenly disturbed 
in any way, reacts much as if a dog had come upon it, 
though in a less marked manner. 
Nevertheless, the behaviour of a kitten, even a few 
days after its birth, towards even the smell of a dog on 
the hands, is very suggestive of an instinctive fear or 
dislike of the dog. At the same time, I have seen a 
kitten act much the same when an irritant was placed 
near its nose, or, after it could hear, when it was 
startled by a noise. This subject is worthy of further 
study. 
Equally striking in the kitten, as in the puppy, is 
the rapidity with which the creature tires under any 
sort of stimulus, especially within the first twenty days 
of life. After a few trials, sometimes after the very 
first one, the smell of a dog ceases to produce the re- 
action in the cat during the blind period, and unless 
one is aware of this, all sorts of erroneous conclusions 
may be drawn regarding very young animals. This 
tendency to rapid fatigue indicates, in reality, both why 
the animals do sleep and must sleep so often. I am 
quite satisfied that any sort of irritation, whether from 
within or from without, that will prevent frequent 
periods of sleep occurring, will disorder the health and 
even cause death in young animals, and I believe this 
