The silk manufacture, though originating in the secretion of a tiny caterpillar, is perhaps equally extraordinary. Hundreds of thousands of pounds weight of this slender thread, no thicker than the filaments spun by a spider, give employment to millions of workers throughout the world. Silk, and the many textures wrought from this beautiful material, had long been known in the East; but the period cannot be fixed when man first divested the chrysalis of its dwelling, and discovered that the little yellow ball which adhered to the leaf of the mulberry tree, could be evolved into a slender filament, from which tissues of endless variety and beauty could be made. The Chinese were doubtless among the first who used the thread spun by the silkworm for the purposes of clothing. The manufacture went westward from China to India and Persia, and from thence to Europe. Alexander the Great brought home with him a store of rich silks from Persia Aristotle and Pliny give descriptions of the industrious little worm and its productions. Virgil is the first of the Roman writers who alludes to the production of silk in China; and the terms he employs show how little was then known about the article. It was introduced at Rome about the time of Julius Caesar, who displayed a profusion of silks in some of his magnificent theatrical spectacles. Silk was so valuable that it was then sold for an equal weight of gold. Indeed, a law was passed that no man should disgrace himself by wearing a silken garment. The Emperor Heliogabalus despised the law, and wore a dress composed wholly of silk. The example thus set was followed by wealthy citizens. A demand for silk from the East soon became general. It was not until about the middle of the sixth century that two Persian monks, who had long resided in China, and made themselves acquainted with the mode of rearing the silkworm, succeeded in carrying the eggs of the insect to Constantinople. Under their direction they were hatched and fed. A sufficient number of butterflies were saved to propagate the race, and mulberry trees were planted to afford nourishment to the rising generations of caterpillars. Thus the industry was propagated. It spread into the Italian peninsula; and eventually manufactures of silk velvet, damask, and satin became established in Venice, Milan, Florence, Lucca, and other places.