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Small, viewless aeronaut, &c. &c.

The almost imperceptible threads floating in the air, towards the end of Summer or Autumn, in a still evening, sometimes are so numerous as to be felt on the face and hands. It is on these that a minute species of spider convey themselves from place to place; sometimes rising with the wind to a great height in the air. Dr Lister, among other naturalists, remarked these insects. "To fly they cannot strictly be said, they being carried into the air by external force; but they can, in case the wind suffer them, steer their course, perhaps mount and descend at pleasure: and to the purpose of rowing themselves along in the air, it is observable that they ever take their flight backwards, that is, their head looking a contrary way like a sculler upon the Thames. It is scarcely credible to what height they will mount; which is yet precisely true,