Page:Philosophical Transactions - Volume 001.djvu/96

 never break off, themselves. This, he affirms, they put out with so much quickness, and draw it so subtle and so long, that, without an Hyperbole, the end or thread of every Case may have two Leagues in length. He advertiseth, that they must be by no means interrupted in their work, to the end, that all the Silk, they have in their bellyes, may come out.

Some eight dayes after they have finished their Work, as many of the best Cases, as are to serve for seed, viz. the first done, the hardest, the reddest and best coloured, must be chosen, and put a-part; and all diligence is to be used to winde off the silk with as much speed, as may be, especially if the Worms have nimbly dispatched their work.

Here he spends a good part of his Book, in giving very particular Instructions, concerning the way of winding off the silk, setting also down the form of the Oven and Instruments necessary for that work, which is the painfullest and nicest of all the rest.

Touching their Generation, he prescribeth that there be chosen as many male as female-Cases (which are discerned by this, that the males are more pointed at both ends of the Cases, and the females more obtuse on the ends, and bigger-bellyed) and that care be had, that no Cases be taken, but such wherein the Worms are heard rolling; which done, and they being come forth in the form of Butterflyes, having four wings, six feet, two horns, and two very black eyes, and put in a convenient place, the males fluttering with their wings, will joyn and couple with the females, after that these have first purged themselves of a kind of reddish humour by the fundament: in which posture they are to be left from Morning (which is the ordinary time of their coming forth) till evening, and then the females are to be gently pulled away, whereupon they will lay their eggs, having first let fall by the Fundament another humour, esteemed to proceed from the seed of the males; but the males are then thrown away as useless. He advertiseth, that if they be coupled longer then 9. or 10. hours, (which they will be, and that sometimes for 24. hours together, if they be let alone) either the female will receive very great hurt by it, or much seed will remain in her belly. Rh