stalk at this time had one for a tenant--before a cat, and then watching
her movements. Smelling her prey, she would spring at one end of the
stalk--the end towards which the mouse would be moving at the same time,
but would catch nothing, for the mouse, instead of running out, would
turn back to run to the other end; whereupon the cat, all excitement,
would jump there to seize it; and so the contest would continue for a
long time, an exhibition of the cleverness and the stupidity of
instinct, both of the pursuer and the pursued. There were several cats
at the house, and all acted in the same way except one. When a stalk was
placed before this cat, instead of becoming excited like the others, it
went quickly to one end and smelt' at the opening, then, satisfied that
its prey was inside, it deliberately bit a long piece out of the stalk
with its teeth, then another strip, and so on progressively, until the
entire stick had been opened up to within six or eight inches of the
further end, when the mouse came out and was caught. Every stalk placed
before this cat was demolished in the same businesslike way; but the
other cats, though they were made to look on while the stick was being
broken up by their fellow, could never learn the trick.

In the autumn of the .year countless numbers of storks (Ciconia maguari)
and of short-eared owls (Otus brachyotus) made their appearance. They
had also come to assist at the general feast.

Remembering the opinion of Mr. E. Newman, quoted by Darwin, that
two-thirds of the humble bees in England are annually destroyed by mice,
I determined to continue observing these insects, in order to ascertain
whether the same thing occurred on the pampas. I carefully revisited all
the nests I had found, and was amazed at the rapid disappearance of all
the bees. I was quite convinced that the mice had devoured or driven
them out, for the weather was still warm, and flowers and fruit on which