As soon as the mulberry begins to unfold its leaves, the eggs of the silk-worms should be laid on the shelves, and when they begin to turn white, which will be in about ten days if the room has been kept at a proper temperature, they should be covered over with little trays made of writing-paper turned upside down, and pierced full of holes with a large knitting-needle. On each tray should be laid some young twigs of the mulberry, which the insects will smell as soon as they are hatched, and, crawling through the holes in the paper, will begin to eat. As soon as a twig is covered all over with silk-worms, it should be carefully removed to another shelf, and the insects placed on blotting-paper. Each insect should be allowed about a square inch of paper. It should then be fed with chopped leaves, and it will appear to pass the greater part of its time in sleep till it changes its skin. In its second state it will also appear to pass a great portion of its time in sleep; but it may be fed with young leaves without chopping, till it changes its skin a second time. In its third state the silk-worm becomes more lively and vigorous, and it will devour full-grown leaves without chopping. Up to this period of its life it will be sufficient to feed it three times a day. After changing its skin a third time, the silk-worm becomes of a flesh colour, and eats so greedily that it should be kept supplied with a succession of leaves all day long. After the next change the silk-worm eats abundantly night and day, and should be kept warm. It now begins to get restless, and instead of eating is continually stretching out its head as though it were in search of something; its body will have become transparent, of a clear pearly hue, with bands of gold colour. Little bits of wood should now be fixed on the shelves in such a way as to give the insects a feeling of security; and they will immediately begin to make their cocoons, which they will complete in from four to seven days.