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ference of the quantity of the action of the humor. The hygrometer which remained at the lowest was the one that was always in the shade, and was not mounted. It was the same upon which I had made my observations in the mountains of Sixt. I suspended them both in the garden l have been speaking of, about 6 in the morning; the plants were covered with dew; the fun, being just rising, could not yet shine on the garden. As soon u the hygrometers were exposed in the open air, they both fell very rapidly, but the one which was without the frame fell much faster than the other. They both were continuing to fall, when the fun began to shine in the garden. The following is an account or their progess and of that of the thermometers during 19 hours The action of the heat upon the mercury of the hygrometer is corrected upon each of them, from the observation of the thermometer joined to it, so that there only remains that of the humor.

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