The children were all much interested in the account which their mother
had given them, and united in requesting some information respecting the
other species of _hirundines_. This, Mrs. Bernard most willingly gave
them, as follows:

"The house-martin, my dears, usually appears a few days later than the
swallow. For some time after their arrival, they play and sport about,
without any preparation for constructing their nests, which they do not
attempt to build till about the middle of May. At this season, if the
weather be fine, they begin seriously to think of providing a mansion
for their little family. This bird usually builds against a
perpendicular wall, without any projection to support the fabric; it is,
therefore, very necessary that the first foundation should be firmly
fixed. For this purpose, the prudent little architect is careful not to
advance in her work too rapidly. By building only in the morning, and
dedicating the remainder of the day to food and amusement, she gives it
sufficient time to dry and harden, seldom building more than half an
inch in a day."

_Ferdinand_. Mamma, I have seen workmen, when they build mud walls,
raise but a little at a time, and then leave off: very likely it was
their observation of the martin's plan, which first taught them this
prudent caution.

_Mrs. B._ Very probably, my dear. We might learn many a useful lesson
from the sagacity and careful economy of animals, were we not above
attending to such humble instructors.

_Ferdinand_. Yes, mamma; the shepherd, in one of Gay's Fables, which I