Page:The history of silk, cotton, linen, wool, and other fibrous substances 2.djvu/160

 *tations among the branches, uncontrolled by the hand and unassisted by the cares of man. As soon, however, as the silken balls have been constructed, they are appropriated by the universal usurper, who spares only the few required to reproduce their numbers, and thus furnish him with successive harvests.

This silk, the spontaneous offering of nature, is not, however, equal in fineness to that produced by worms under shelter, and whose progressions are influenced by careful management. Much attention is, therefore, bestowed by the Chinese in the artificial rearing of silk-worms. One of their principal cares, is to prevent the too early hatching of the eggs, to which the nature of the climate so strongly disposes them. The mode of insuring the requisite delay, is, to cause the moth to deposit her eggs on large sheets of paper: these, immediately upon their production, are suspended from a beam in the room, while the windows are opened to expose them to the air. In a few days the papers are taken down and rolled loosely up with the eggs inside, in which form they are again hung during the remainder of the summer and autumn. Towards the end of the year they are immersed in cold water wherein a small portion of salt has been dissolved. In this state the eggs are left during two days; and on being taken from the salt and water are first hung to dry, and then rolled up rather more tightly than before, each sheet of paper being thereafter inclosed in a