These processes appear efficacious for checking the hatching, until the expanding leaves of the mulberry-tree give notice to the silk-worm-rearer that he may take measures for bringing forth his brood. For this purpose the rolls of paper are taken from the earthen vessels, and hung up towards the sun, the side to which the eggs adhere being turned from its rays, by being placed inside, and thus allowing the heat to be transmitted to them through the paper. In the evening the sheets are rolled closely up and placed in a warm situation. The same proceeding is repeated on the following day, when the eggs assume a grayish color. On the evening of the third day, after a similar exposure, they are found to be of a much darker color, nearly approaching to black; and the following morning, on the paper being unrolled, they are covered with worms. In the higher latitudes the Chinese have recourse to the heat of stoves, in order to promote the simultaneous hatching of the eggs. The apartments in which the worms are kept stand in dry situations, in a pure atmosphere, and apart from all noise, which is thought to be annoying to the worms, especially when they are young. The rooms are made very close, but adequate means of ventilation provided: the doors being open to the south. Each chamber is provided with nine or ten rows of frames, placed one above the other. On these frames, rush hurdles are ranged; upon which the worms are fed through their five ages. A uniform degree of heat is constantly preserved, either by means of stoves placed in the corners of the apartments, or by chafing-dishes which from time to time are carried up and down the room. Flame and smoke being always carefully avoided: cow-dung dried in the sun is preferred by the Chinese to all other kinds of fuel for this purpose. The most unremitting attention is paid to the wants of the worms, which are fed night and day. On their being hatched they are furnished with forty meals for the first day, thirty are given on the second day, and fewer on and after the third. The Chinese believe that the growth of silk-worms is accelerated, and their success promoted by the abundance of their food, and therefore, in cloudy and damp weather, when the insects are injuriously affected by the state of the atmosphere, their appetites are stimulated by a wisp of very dry straw being lighted and held over them, thus causing the cold and damp air to be dissipated.