Page:The history of silk, cotton, linen, wool, and other fibrous substances 2.djvu/457

 known how to make paper. We are still behind in our arts and sciences, because we have not always been observers. If we had watched the operations of insects, and the structure of insects in general, with more care, we might have been far advanced in the knowledge of many arts which are yet in their infancy, for nature has given us abundance of patterns. We have learnt to perfect some instruments of sound by examining the structure of the human ear; and the mechanism of an eye has suggested some valuable improvements in achromatic glasses.

Réaumur has given a very interesting account of the wasps of Cayenne (Chartergus nidulans), which hang their nests in trees. Like the bird of Africa called the social grosbeak (Loxia socia), they fabricate a perfect house, capable of containing many hundreds of their community, and suspend it on high out of the reach of attack. But the Cayenne wasp is a more expert artist than the bird. He is a pasteboard-maker;—and the card with which he forms the exterior covering of his abode is so smooth, so strong, so uniform in its texture, and so white that the most skilful manufacturer of this substance might be proud of the work. It takes ink admirably!

The nest of the pasteboard-making wasp is impervious to water. It hangs upon the branch of a tree, and those rain-*drops which penetrate through the leaves never rest upon its hard and polished surface. A small opening for the entrance of the insects terminates its funnel-shaped bottom. It is impossible to unite more perfectly the qualities of lightness and strength.

Mr. J. Rennie, speaking of wasps' nests, gives us the following interesting account of one lately examined by him:—"The length," says he, "is about nine inches, six stout circular platforms stretch internally across, like so many floors, and fixed all round to the walls of the nest. They are smooth above, with hexagonal cells on the under surface. These platforms are not quite flat, but rather concave above, like a watch-glass reversed;