ascertain, and cannot even conjecture. The meal contains no
gluten, and therefore would be useless as cement. It contains
only a smallrelative portion of starch, and, when mixed with
water, it separates and falls away like so much earthy matter. It
may serve as food for the subterranean workers. But the young or
larvae of ants are usually fed by juices secreted by the worker
nurses.

Ants, it is scarcely necessary to observe, consist, in each
species, of three sets of individuals, Or, as some express it, of
three sexes--namely, males, females, and workers; the last-
mentioned being undeveloped females. The perfect sexes are winged
on their first attaining the adult state; they alone propagate
their kind, flying away, previous to the act of reproduction,
from the nest in which they have been reared. This winged state
of the perfect males and females, and the habit of flying abroad
before pairing, are very important points in the economy of ants;
for they are thus enabled to intercross with members of distant
colonies which swarm at the same time, and thereby increase the
vigour of the race, a proceeding essential to the prosperity of
any species. In many ants, especially those of tropical climates,
the workers, again, are of two classes, whose structure and
functions are widely different. In some species they are
wonderfully unlike each other, and constitute two well-defined
forms of workers. In others, there is a gradation of individuals
between the two extremes. The curious differences in structure
and habits between these two classes form an interesting, but
very difficult, study. It is one of the great peculiarities of
the Sauba ant to possess three classes of workers. My
investigations regarding them were far from complete; I will