larvae behaved in a most exemplary manner, especially when they became
larger. They crawled over each other's backs without the least sign of
spite or animosity, even when they were in sleep, in which case larvae
are generally very sensitive and irritable, all were of a most pacific
nature. It is, therefore, with the greatest pleasure that, for want of
sufficient evidence, I withdraw this serious charge of cannibalism which
I first intended to bring against them.

From what has been said respecting the rearing of exotic silk-producing
bombyces, especially tropical species, it must have been observed
that several difficulties, standing in the way of success, have to be
overcome. The moths of North American species emerge regularly enough
during the months of May, June, or July, but Indian and other tropical
species may emerge at any time of the year, if the weather is mild, as
has been the case during this unusually mild winter of 1881-1882. From
the end of December to the present time (March 14, 1882) moths of four
species of Indian silk-producers, especially _Antheraea roylei_ and
_Actias selene_, have constantly emerged, but only one or two at a time.
These moths emerged from cocoons received in December and January last.

It is only when these tropical species shall have been already reared in
Europe that the emergence of the moths will be regular; then they will
be single-brooded in Northern or Central Europe, and some will very
likely become double-brooded in Southern Europe. But when just imported
the moths of these tropical species will always be uncertain and
irregular in their emergence; hence the importance of having a
sufficient number of cocoons so as to meet this difficulty, i.e., the
loss of the moths that emerge prematurely or irregularly.

Before I conclude, I shall repeat what I already stated in a previous