ure, or, knowing the temperature, can determine the pitch. Of
course this is too mechanical; yet it indicates that there must be
considerable relation between the two; the warmer the cricket the
happier he is.

It is the males among insects that chirp their love songs. The females
never answer them. There is a peculiar notion that the female katydid,
when thus accused of some offense, replies "katy didn't." The truth of
the matter is that no female katydid ever replied to the accusations
of her lover, if accusation it be. She is absolutely dumb, not having
the drum upon her wings with which to reply. She is provided with ears
wherewith to hear, and, strange to say, she keeps them on her elbow,
as does also the cricket, while the grasshopper has his ears upon the
side of his body.

Everyone who lives in the country, or goes into the country in the
summertime, is sure to know the humming of the so-called locust. It is
an unfortunate fact that the word locust may have several meanings. It
is properly applied to one group of the grasshoppers. The creature
most commonly called a locust is a cicada, or harvest fly. When the
weather gets quite warm the cicada starts his love song. He has two
long flaps to his vest, and under each flap he has a vibrating drum
head. This is set shivering by a muscle on its under side. The female
cicada again is silent.

It is among birds that the love song reaches its finest development.
It may consist simply of a little chirp as in the chippy. It may
consist of two notes of a different pitch repeated steadily, as in the
tufted titmouse. It may attain considerable variation, as in the
robin. But in the choir of our best singers, like the catbird,
thrasher, and mocking bird, there is unending variation of notes. It
seems almost impossible to doubt the charming quality of this voice
upon the mate. It certainly is chiefly confined to the mating season,
and is indulged in almost entirely by the males. This does not mean
that a male does not sing excepting when he wishes to charm his mate.
But the time when he is in his most exquisite feather and most
charming mood is the time when he sings most sweetly, and this is the
time when he is taking to himself a mate. The love joy may so
overcrowd his life that he sings much and often, but the increase in
its amount and character during the mating season seems to proclaim
its purpose beyond a doubt.

In addition to the allurements above described there