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Within the hotel chemical odors ebbed and flowed like an atmospheric tide.

If the reader has watched his barometer narrowly, he has observed a very remarkable phenomenon, which is not known to prevail outside of the trade-wind belts—an atmospheric tide.

This atmospheric tide is due, no doubt, to the same cause that produces the aqueous tides—the attraction of the moon.

But the existence of any atmospheric tide at all is denied by some naturalists, and is at most very problematical; and the absence of regular diurnal fluctuations of the barometric pressure favours the negative of this proposition.

But there are other variations of the barometer of longer period, apparently depending on the phases of the moon, but which cannot be reconciled to the attracting power of the moon as an atmospheric tide; and Arago concluded that they were due to some special cause, of which the nature and mode of action are unknown.