XVI. THE CHRYSALIS YEAR.

In warm spots under hedges, I see, the first spring insects now begin to appear, timidly and tentatively, from the shelter of their cocoons. Some few of them, indeed, like the lady-birds, the wasps, and the bumble-bees, have struggled through the winter in the winged or perfect form, having hibernated among warm moss or under the bark of trees in favoured situations. These adventurous kinds passed through their larval and pupal stages last year, and a tithe of them live on with difficulty through the winter frosts, to become the mothers and founders of fresh insect communities as April comes round again. But by far the greater number eat and grow as grubs or caterpillars through the summer months, and when autumn approaches turn into cocoons or chrysalides, to lie by for the winter in a snug retreat, well wrapped up in a warm silky or woollen coverlet, and protected underground from snow or hoarfrost. As soon as cold weather approaches, these prudent insects retire from public life, cease from active pursuits, melt themselves up into a sort of organic pulp, lose almost every distinguishable organ or feature, and remain dormant, in a state of indefinite protoplasm, which gradually takes shape again as moth, beetle, or butterfly. Mummies we sometimes call them, but they are not even mummies, for they lose almost entirely their form and limbs; they tide over the winter for the most part in an all but structureless mass, which yet encloses the potentiality of rebuilding in due course the shape and members of the ancestral insect. Slowly new limbs grow out within the protecting chrysalis case, wings bud from the side, and the grub or caterpillar changes by degrees into the totally unlike image of the beetle or butterfly. As soon as warmer weather sets in, the winged forms emerge with the first sunny day from their broken shell. I have seen nettle-butterflies abroad in a spell of genial warmth in the last week of January; a brimstone has been tempted forth to seek his lady-love on St. Valentine’s Day; and fritillaries are abundant in early March sunshine. Lesser insects, whose names are enshrined in scientific Latin alone, often emerge from their mummy-cases even earlier than these familiar and conspicuous lepidoptera.

The moment they peep forth, lo and behold! they find the plant world, for its part, ready decked to greet them. The very same morning that sees the first butterfly and the first bee on the wing, sees also the first crocus opening wide its shining cup in the full sun to woo them. The brimstone is no sooner out than the coltsfoot and the celandine and the bulbous buttercup spread their gold to allure him. And has it ever struck you that the plants, no less than the animals, pass through the winter period in the chrysalis condition? This is no mere figurative flower of speech; it is the scientific statement of a real and profound analogy. During the summer months the leaves of the crocus, the tulip, and the hyacinth have been eating and laying by, exactly as the caterpillar did, to provide material for next year’s flowering season. When winter blows cold, the leaves die down—the plant, as it were, retires underground into its bulb, like the caterpillar into the cocoon, and there remains, formless and organless, a mere pupa-like potentiality of future buds and blossoms. But when warm weather recurs, the bulb once more begins to germinate: it takes fresh form as a vigorous flower-head. Observe, too, that the flowering stem, like the winged stage of the insect, is the sexual epoch of the plant, an avatar told off, as the butterfly by the caterpillar, to produce the seeds which are the eggs of the species. In each case a certain definite period of time is passed in laying by material, in eating and storing only; then comes a quiescent epoch of rest and rebuilding; and this again is followed by a mature stage of marriage and reproduction. Notice, too, in either instance, that the reproductive stage is more beautifully formed and more attractively coloured than the mere accumulative and storing mechanism.

What is thus true of the crocus and of the butterfly is true, to a great extent, of all plants and animals in temperate or cold climates. They enter every winter into a chrysalis stage, from which in early spring they emerge once more, still more beautiful than before, freshly adorned for the mating and nesting period. Trees lose their leaves, and withdraw their protoplasmic and starchy material in a shapeless mass into the permanent tissues; but they hold it there, ready to manufacture it once more into bright green foliage and tasselled catkins, into blushing apple-blossoms, or tall spikes of horse-chestnut flower, or pink bloom of elms, with the first spring sunshine. Squirrels hibernate; moles sleep away the dead of winter; frogs retire to the depths of ponds; slugs bury themselves in the soil; dormice doze in well-lined crannies among the boles of hazels. Many species only tide over the cold weather, indeed, in the most potential form, as eggs or seeds; they are annuals, like the poppy or the aphides of roses. In such cases the whole race is represented for some months by its germs alone: one generation never sees or knows the existence of another. In other instances, somewhat higher, the species survives as pupa or as bulb, adult, no doubt, though in a relatively formless or indefinite shape, yet ready to come forth full-fledged and perfect at the first faint breath of returning summer. Still other kinds, again, struggle through as mature and fully formed insects, or birds, or mammals, and as evergreen trees or shrubs, though they live for the most part a life of low grade, and on accumulated materials. Nature is almost dormant in our zone through the winter months; life is then one vast and varied chrysalis.