[Illustration: SWALLOW PREPARING A WALL FOR HER NEST.]

[Illustration: BLACKBIRD BUILDING HER NEST.]

Such is the wonderful instinct of birds with respect to the structure of
their nests. What skill and sagacity! what industry and patience do they
display! And is it not apparent that all their labours tend towards
certain ends? They construct their nests hollow and nearly round, that
they may retain the heat so much the better. They line them with the
most delicate substances, that the young may lie soft and warm. What is
it that teaches the bird to place her nest in a situation sheltered from
the rain, and secure against the attacks of other animals? How did she
learn that she should lay eggs--that eggs would require a nest to
prevent them from falling to the ground and to keep them warm? Whence
does she know that the heat would not be maintained around the eggs if
the nest were too large; and that, on the other hand, the young would
not have sufficient room if it were smaller? By what rules does she
determine the due proportions between the nest and the young which are
not yet in existence? Who has taught her to calculate the time with such
accuracy that she never commits a mistake, in producing her eggs before
the nest is ready to receive them? Admire in all these things the power,
the wisdom, and the goodness of the Creator!

STURM.

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