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The frog and the toad lay hundreds of eggs, the fishes spawn thousands, but most birds lay only five or six eggs. A spendthrift with one hand, Nature is often a miser with the other. She lets loose an army of worms upon the forests, and then sends an ichneumon-fly to check them. She wastes no perfume or color upon the flowers which depend upon the wind to scatter their pollen.

What of the infinite goodness of God in teaching the grub of the ichneumon-fly to eat up the cabbage caterpillar alive? I see no infinite goodness here, but only the infinite foolishness of sentimental superstition. If a man fell into the sea, and saw a shark coming, I cannot fancy him praising the infinite goodness of God in giving the shark so large a mouth.

After a few days we saw, from more than three fourths of them, about eight or ten little caterpillars of the ichneumon-fly come out of their backs, and spin each a small cocoon of silk, and in a few days the large caterpillars died.

The ichneumon-fly lays its eggs under the skin of the caterpillar. The eggs are hatched by the warmth of the caterpillar's blood. They produce a brood of larvae which devour the caterpillar alive. A pretty child dances on the village green. Her feet crush creeping things: there is a busy ant or blazoned beetle, with its back broken, writhing in the dust, unseen.

The young caterpillars of the gadfly placed in the skins of cows, and the young of the ichneumon-fly placed in the backs of the caterpillars on cabbages, seem to produce their nourishment by their irritating the sides of their nidus.

To enjoy understandingly, that, I fancy, is the great thing to be desired. When I see the large ichneumon-fly, Thalessa, making a loop over her back with her long ovipositor and drilling a hole in the trunk of a tree, I do not fully appreciate the spectacle till I know she is feeling for the burrow of a tree-borer, Tremex, upon the larvae of which her own young feed.