Birdlime is made of the berries of the mistletoe, which are gathered at harvest, and while in an unripe state; for if the rainy season comes on, though they increase in size, the viscous juice is apt to lose its virtues. They are then dried,[1] and when brought to a state of perfect aridity, are first pounded, and then put in water, in which they are left to rot for twelve days; this being, in fact, the only thing that finds improve- ment in decay. After this, they are again beaten in running water with a mallet, and after losing the outer coat there is only the viscous inner pulp remaining. This substance is birdlime; and after it has been thinned by the addition of walnut oil, it is found particularly useful for catching birds, it being quite sufficient if they only touch it with the wings.