70 Animal Intelligence 
A page or two later we find a less ponderous account of 
a cat’s success in turning aside a button and so opening a 
window : — 
“At Parara, the residence of Parker Bowman, Esq., a full- 
grown cat was one day accidentally locked up in a room without 
any other outlet than a small window, moving on hinges, and 
kept shut by means of a swivel. Not long afterwards the win- 
dow was found open and the cat gone. This having happened 
several times, it was at last found that the cat jumped upon the 
window sill, placed her fore paws as high as she could reach 
against the side, deliberately reached with one over to the 
swivel, moved it from its horizontal to a vertical position, and 
then, leaning with her whole weight against the window, swung 
it open and escaped.” (Animal Intelligence, p. 425.) 
A description has already been given on page 31 of the 
small box (C), whose door fell open when the button was 
turned, and also of a large box (CC) for the dogs, with a 
similar door. The thumb-latch experiment was carried 
on with the same box (G) for both cats and dogs, but the 
door was arranged so that a greater force (1.3 kilograms) 
was required in the case of the dogs. It will be remembered 
that the latch was so fixed that if the thumb piece were 
pressed down, without contemporaneous outward pressure 
of the door, the latch bar would merely drop back into its 
catch as soon as the paw was taken off the door. If, how- 
ever, the door were pushed outward, the latch bar, being 
pressed closely against the outer edge of its catch, would, 
if lifted, be likely to fall outside it and so permit the door 
to open if then or later sufficient pressure were exerted. 
Eight cats (Nos. 1, 2, 3, 4, 5, 6, 7 and 13) were, one at a time, 
left in this thumb-latch box. All exhibited the customary 
instinctive clawings and squeezings and bitings. Out of 
the eight all succeeded in the course of their vigorous 
