the working of the revolving mirror used in catching
Larks. If stationary, the little contrivance would leave the bird
indifferent; turning and breaking up its light in rapid flashes, it
excites it.

While the female Glow-worm has her tricks for summoning her swains, the
male, on his side, is provided with an optical apparatus suited to
catch from afar the least reflection of the calling signal. His
corselet expands into a shield and overlaps his head considerably in
the form of a peaked cap or a shade, the object of which appears to be
to limit the field of vision and concentrate the view upon the luminous
speck to be discerned. Under this arch are the two eyes, which are
relatively enormous, exceedingly convex, shaped like a skull-cap and
contiguous to the extent of leaving only a narrow groove for the
insertion of the antennae. This double eye, occupying almost the whole
face of the insect and contained in the cavern formed by the spreading
peak of the corselet, is a regular Cyclops' eye.

At the moment of the pairing the illumination becomes much fainter, is
almost extinguished; all that remains alight is the humble fairy-lamp
of the last segment. This discreet night-light is enough for the
wedding, while, all around, the host of nocturnal insects, lingering
over their respective affairs, murmur the universal marriage-hymn. The
laying follows very soon. The round, white eggs are laid, or rather
strewn at random, without the least care on the mother's part, either
on the more or less cool earth or on a blade of grass. These brilliant
ones know nothing at all of family affection.

Here is a very singular thing: the Glow-worm's eggs are luminous even
when still contained in the mother's womb. If I happen by accident to
crush a female big with germs that have reached maturity, a shiny
streak runs along my fingers, as though I had broken some vessel filled
with a phosphorescent fluid. The lens shows me that I am wrong. The
luminosity comes from the cluster of eggs forced out of the ovary.
Besides, as laying-time approaches, the phosphorescence of the eggs is
already made manifest through this clumsy midwifery. A soft opalescent
light shines through the integument of the belly.

The hatching follows soon after the laying. The young of either sex
have two little rush-lights on the last segment. At the approach of the
severe weather they go down into the ground, but not very far. In my
rearing-jars, which are supplied