me, "to see so great signs of joy." I have also myself witnessed
similar signs of joy at the coming of the student. Jaco's speech at
such times is always in harmony with his feelings. In the pleasant
season Jaco's cage is put outdoors; and at meal times, knowing very
well what is going on within, he keeps up a steady course of suppliant
appeals for attention. His appeals cease at once if I go out with
fruit in my hand, and if I go toward him he utters a prattle of joy
that sounds like musical laughter. These manifestations indicate that
he is happy at seeing that he has been thought of.

I close these anecdotes, as I began them, by repeating that animals
communicate their impressions, and the feelings that move them, by
various modulations of their inarticulate cries, which are
incomprehensible to us unless we have succeeded by attentive
observation in connecting them with the acts that follow or precede
them. We have also seen that the articulation of a few words learned
by parrots aids us greatly in learning the meaning of these different
inflections.

The extension of these studies would furnish much of interest; but
further observations should be made upon the same animals for a
longtime continuously, relating especially to their peculiar instincts
as manifested by their various cries. We might then, by comparing and
relating acts and cries, reach the point of comprehending and perhaps
fixing the meaning in many cases where we are now in ignorance. Every
one has noticed a few facts, and has interpreted and related them, but
much is still wanting for the co-ordination of them in the point of
view of the signification of the language and communication of animals
among themselves. It has not been made in a general sense.
--_Translated for the Popular Science Monthly from the Revue