he trellised enclosure I once saw under excellent conditions. At
the advent of the cold weather, I had placed a few cabbage-stalks,
covered with caterpillars, in a small greenhouse. Those who saw the
common kitchen vegetable sumptuously lodged under glass, in the company
of the pelargonium and the Chinese primrose, were astonished at my
curious fancy. I let them smile. I had my plans: I wanted to find out
how the family of the Large White Butterfly behaves when the cold
weather sets in. Things happened just as I wished. At the end of
November, the caterpillars, having grown to the desired extent, left
the cabbages, one by one, and began to roam about the walls. None of
them fixed himself there or made preparations for the transformation. I
suspected that they wanted the choice of a spot in the open air,
exposed to all the rigours of winter. I therefore left the door of the
hothouse open. Soon the whole crowd had disappeared.

I found them dispersed all over the neighbouring walls, some thirty
yards off. The thrust of a ledge, the eaves formed by a projecting bit
of mortar served them as a shelter where the chrysalid moult took place
and where the winter was passed. The Cabbage-caterpillar possesses a
robust constitution, unsusceptible to torrid heat or icy cold. All that
he needs for his metamorphosis is an airy lodging, free from permanent
damp.

The inmates of my fold, therefore, move about for a few days on the
trelliswork, anxious to travel afar in search of a wall. Finding none
and realizing that time presses, they resign themselves. Each one,
supporting himself on the trellis, first weaves around himself a thin
carpet of white silk, which will form the sustaining layer at the time
of the laborious and delicate work of the nymphosis. He fixes his
rear-end to this base by a silk pad and his fore-part by a strap that
passes under his shoulders and is fixed on either side to the carpet.
Thus slung from his three fastenings, he strips himself of his larval
apparel and turns into a chrysalis in the open air, with no protection
save that of the wall, which the caterpillar would certainly have found
had I not interfered.

Of a surety, he would be short-sighted indeed that pictured a world of
good things prepared exclusively for our advantage. The earth, the
great foster-mother, has a generous breast. At the very moment when
nourishing matter is created, even though it be with our own zealous
aid, she summons to the fea