There are but few of our readers who are not familiar with the caterpillar of the Isabella Tiger Moth, one of our commonest “woolly bears,” and found, we believe, in almost every part of canada and the Northern United States. This larva, in common with many other members of the family (arctidæ) to which it belongs, hybernates during the winter. It acquires nearly full growth in the autumn, and then, having selected a cosy sheltered spot under bark, 1og, rail, stone or board in which to hide, it coils itself up there into a sort of ball and sleeps through the long and dreary winter, and about the time when the birds come back and the warm days of spring begin, this bristly creature rouses itself to begin rife anew.