Having found a twig to suit her, she makes a row of pricks with the sharp instrument on her chest—such pricks as might be made with a pin if it were driven downwards on a slant, so as to tear the fibres and force them slightly upwards. If she is undisturbed she will make thirty or forty of these pricks on the same twig.
In the tiny cells formed by these pricks she lays her eggs. The cells are narrow passages, each one slanting down towards the one below it. I generally find about [[36]]ten eggs in each cell, so it is plain that the Cicada lays between three and four hundred eggs altogether.
This is a fine family for one insect. The numbers point to some special danger that threatens the Cicada, and makes it necessary to produce a great quantity of grubs lest some should be destroyed. After many observations I have discovered what this danger is. It is an extremely tiny Gnat, compared with which the Cicada is a monster.
This Gnat, like the Cicada, carries a boring-tool. It is planted beneath her body, near the middle, and sticks out at right angles. As fast as the Cicada lays her eggs the Gnat tries to destroy them. It is a real scourge to the Cicada family. It is amazing to watch her calm and brazen audacity in the presence of the giant who could crush her by simply stepping on her. I have seen as many as three preparing to despoil one unhappy Cicada at the same time, standing close behind one another.
The Cicada has just stocked a cell with eggs, and is climbing a little higher to make another cell. One of the brigands runs to the spot she has just left; and here, almost under the claws of the monster, as calmly and fearlessly as though she were at home, the Gnat bores a second hole above the Cicada’s eggs, and places among them an egg of her own. By the time the Cicada flies away most of her cells have, in this way, received a [[37]]stranger’s egg, which will be the ruin of hers. A small quick-hatching grub, one only to each cell, handsomely fed on a dozen raw eggs, will take the place of the Cicada’s family.
This deplorable mother has learnt nothing from centuries of experience. Her large and excellent eyes cannot fail to see the terrible felons fluttering round her. She must know they are at her heels, and yet she remains unmoved, and lets herself be victimised. She could easily crush the wicked atoms, but she is incapable of altering her instincts, even to save her family from destruction.
Through my magnifying-glass I have seen the hatching of the Cicada’s eggs. When the grub first appears it has a marked likeness to an extremely small fish, with large black eyes, and a curious sort of mock fin under its body, formed of the two fore-legs joined together. This fin has some power of movement, and helps the grub to work its way out of the shell, and also—a much more difficult matter—out of the fibrous stem in which it is imprisoned.
As soon as this fish-like object has made its way out of the cell it sheds its skin. But the cast skin forms itself into a thread, by which the grub remains fastened to the twig or stem. Here, before dropping to the ground, it treats itself to a sun-bath, kicking about and [[38]]trying its strength, or swinging lazily at the end of its rope.
Its antennæ now are free, and wave about; its legs work their joints; those in front open and shut their claws. I know hardly any more curious sight than this tiny acrobat hanging by the tip of its body, swinging at the least breath of wind, and making ready in the air for its somersault into the world.
Sooner or later, without losing much time, it drops to the ground. The little creature, no bigger than a Flea, has saved its tender body from the rough earth by swinging on its cord. It has hardened itself in the air, that luxurious eiderdown. It now plunges into the stern realities of life.