M. Bon undoubtedly produced, from the silk of his spiders, a material that readily absorbed all kinds of dyes, and was capable of being worked in any loom. With his carded spider's silk the enthusiastic experimentalist wove gloves and stockings, which he presented to one or two learned societies. To these productions several eminent men took particular exceptions. They discovered that the fineness of the separate threads of the silk detracted from its lustre, and inevitably produced a fabric less refulgent than those woven from the silkworm. M. Reaumur's most conclusive fact against the adoption of spider's silk as an article of manufacture, was deduced from his observations on the combativeness of spiders. He discovered that they had not arrived at that state of civilization when communities find it most to the general advantage to live on terms of mutual amity and confidence; on the contrary, the spider-world, according to M. Reaumur (we are writing of a hundred and forty years ago), was in a continual state of warfare; nay, not a few spiders were habitual cannibals. Having collected about five thousand spiders (enough to scare the most courageous old lady), M. Reaumur shut them up in companies varying in number from fifty to one hundred. On opening the cells, after the lapse of a few days, "what was the horror of our hero," as the graphic novelist writes, "to behold the scene which met his gaze!" Where fifty spiders, happy and full of life, had a short time before existed, only about two bloated insects now remained--they had devoured their fellow spiders! This horrible custom of the spider-world accounts for the small proportion of spiders in comparison to the immense number of eggs which they produce. So formidable a difficulty could only be met by rearing each spider in a separate cage; whether this separation is practicable--that is to say, whether it can be made to repay the trouble it would require--is a matter yet to be decided. Against M. Bon's treatise on behalf of spider's silk, M. Reaumur urged further objections. He asserted that, when compared with silkworm's silk, spider's silk was deficient both in quality and in quantity. His calculation went to show that the silk of twelve spiders did not more than equal that of one bombyx; and that no less than fifty-five thousand two hundred and ninety-six spiders must be reared to produce one pound of silk. This calculation is now held to be exaggerated; and the spirit of partisanship in which M. Reaumur's report was evidently concocted, favors the supposition that he made the most of any objections he could bring to bear against M. Bon.