138 ANIMAL INTELLIGENCE 
43rd day.—It is warm, and two are noticed lying in 
a darker and more secluded part of the kennel, where 
there are fewer flies perhaps. 
It is noticed that now one often acts as does another ; 
one seems to take its cue from another. 
44th day.—So very warm, the puppies are prostrated 
by the heat, and lie about, maintaining mere existence. 
45th day.—To-day, for the first time, the door of their 
compartment was left open, so that they might enter 
an adjoining one, which is in general fitted up in the 
same way, so that the environment is substantially 
the same. 
It was curious to note the results. It was some 
minutes before the puppies, the precocious bitch ex- 
cepted, realised that the door was really open, and 
that they had free access to a new compartment. They 
did not at once surmount the difficulty presented by the 
door case only a few inches high. When some of them 
came in and saw the water vessel attached to the other 
side of the wire-mesh partition, they did not at once 
comprehend that they could not drink from it, when 
they saw their fellow on the distant side lapping. All 
this, however, lasted but a very few minutes. Soon 
they all were busy «investigating the new place with 
nose, eyes, feet, etc. 
The new experiences evidently afford them unusual 
pleasure in spite of the heat, as they play more than 
for some days. 
To-day I first used a switch to learn what effect it 
would have on their crying, ete. 
They seem to make the mental association to some 
extent, but only imperfectly. 
One of them, as they crowded around me, was trodden 
upon, and this had a decided and somewhat Jasting 
psychic effect, as will be seen later. As he was running 
away after this accident, I caught him, and was trying to 
