The long-tailed field-mice, as we have already intimated, are fond of dry and elevated grounds. They are to be found in great numbers in woods and in adjoining fields. They conceal themselves in holes under brush-wood, or trunks of trees, which they find already made, or which they dig, in which they amass such quantities of nuts and acorns, that a bushel has been found contained in one of them; and this provision is not proportioned to the wants of the animal, but to the capacity of the place allotted for its reception. These holes are generally more than a foot underground, and often divided into two cells, the one for living in with their young, and the other as a granary. I have often witnessed the considerable damage done by these animals in plantations. They will follow the furrow of a plough and take up all the new-sown acorns, which they convey to their holes; and in a nursery of trees they are more destructive than all the birds and other animals put together. The only method I could ever find to prevent this evil, was to set traps at every tenth pace distance, through the whole extent of the new-sown ground. No other bait is necessary than placing a roasted nut under a flat stone, supported by a piece of stick, to which the nut must be fastened; this they are very fond of, and will come eagerly to seize; but no sooner do they touch it than the stone falls and crushes them to death. I have made use of the same expedient against the campagnol, which is also very destructive. When I first adopted this method, I desired care might be taken to bring me all the animals that were caught in the traps, and it was with astonishment I found more than 100 were taken daily, and this in a piece of land consisting of not more than 40 acres. I obtained more than 2000 in this manner, from the 15th of November to the 8th of December; their numbers afterwards decreased gradually, till the hard frosts commenced, when they retire to their holes, and feed upon what they have collected. A number of years have elapsed since I first made this experiment, and which I always repeated when I sowed trees, and never had reason to complain of its inefficacy. It is in autumn they chiefly abound; in spring they are not so numerous, for if their provisions run short during the winter the strong devour the weak; they also eat the short-tailed species, and several sorts of birds, beginning always with the brains and finishing with the rest of the body. I once put a dozen of these field-mice in a cage, and accustomed them to be fed every morning by eight o'clock; but neglecting them one morning for about a quarter of an hour, one of them had been eaten by the rest; next day they devoured another, and in a few days only one remained; the others having been killed and in part devoured; even the one that survived had his legs and tail mutilated.