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Dr Wollaston obtained platinum-wire so fine, that 30,000 pieces, placed side by side in contact, would not cover more than an inch. It would take 150 pieces of this wire bound together to form a thread as thick as a filament of raw silk. Although platinum is the heaviest of the known bodies, a mile of this wire would not weigh more than a grain. Seven ounces of this wire would extend from London to New York. Fine as is the filament produced by the silkworm, that produced by the spider is still more attenuated. A thread of a spider's web, measuring four miles, will weigh very little more than a single grain. Every one is familiar with the fact, that the spider spins a thread, or cord, by which his own weight hangs suspended. It has been ascertained that this thread is composed of about 6000 filaments.—Lardner's Handbook.

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