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Updated: June 9, 2025


If they are kept cool enough that they do not emerge until May or June, then you have one of the most exquisite treats nature has in store for you, in watching the damp spot spread on the top of the cocoon where an acid is ejected that cuts and softens the tough fibre, and allows the moth to come pushing through in the full glory of its gorgeous birth.

Throwing silk, is twisting two threads into one for the purpose of weaving. The single thread, as wound off from the cocoon, is designated the raw silk. There are two descriptions of thrown silk. One is called tram, and consists of two threads simply twisted together. This description of thrown silk is used in the shuttle or transverse threads of a piece of silk on the loom.

The labor is in itself its own reward and all I want. Here I remain among my fellow-worms, feeding on these musty mulberry-leaves, out of which we are afterwards to spin our silk. How can you expect anything interesting from such a human cocoon? It is, however, not without its amusement in a mouldy sort of way, this reading of dead letters.

This freestone-factory causes me no astonishment: when the manufacturer undergoes his change, it serves for various chemical works. Certain Oil-beetles, such as the Sitaris, locate in it the urate of ammonia, the refuse of the transformed organism; the Sphex, the Pelopæi, the Scoliæ, use it to manufacture the shellac wherewith the silk of the cocoon is varnished.

"I suppose you know what is best to be done, but it seems to me that we are arranging for a very lonesome cruise on regular Box and Cox lines." As White had no knowledge of Box and Cox he did not reply to this grumble, but, rolling up in his blankets until he resembled a huge cocoon, almost instantly dropped asleep.

In many cases this could not be otherwise; thus the inherited peculiarities in the horns of cattle could appear only in the offspring when nearly mature; peculiarities in the silk-worm are known to appear at the corresponding caterpillar or cocoon stage.

On the summit of thinly sown tubercles crowned with a palisade of black hairs are set pearls of a turquoise-blue. The burly brown cocoon, which is notable for its curious tunnel of exit, like an eel-pot, is always found at the base of an old almond-tree, adhering to the bark. The foliage of the same tree nourishes the caterpillar.

The Osmia's larvæ, in fact, contrive to enclose themselves in an egg-shaped cocoon, dark brown in colour and very strong, which preserves them both from the rough contact of their shapeless cells and from the mandibles of voracious parasites, Acari, Cleri and Anthreni, those manifold enemies whom we find prowling in the galleries, seeking whom they may devour.

The mother goes in quest of another prey without troubling further about the egg which has just been laid. There is no effort of carting or building. At the very spot where the Cetonia-grub is caught and paralysed, the Scolia-larva hatches, grows and weaves its cocoon. The establishment of the family is thus reduced to the simplest possible expression.

It seemed to Frederick as if that tremendous vessel, with its hundreds of human ants, were nothing more than the cocoon of this tiny silkworm, this delicately coloured, delicious little butterfly; as if the sixty naked helots down at the ship's bottom shovelling coal into the white heat under the boilers, were toiling and sweating merely to be of service to this childish Venus; as if the captain and officers were the paladins of the queen, and the rest of the crew her following; as if the steerage were rilled with blindly devoted slaves, and as if the Roland were proudly carrying a fairy tale from "A Thousand and One Nights" across the salt desert.

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