The " practical man " is often the true man of science, while he with the scientfic reputation is the one often to merit the contempt sometimes expressed for the merely practical. How this is exemplified a paper on "Climatology of the United States," read before the Essex Institute of Science, affords an instance. Prof. Kimball says, "Again we take the case of a great level plain heated by a summer's sun, till the air at some point commences to rise. As it rises, air will flow in from all sides, and will follow the upward current already created." This reads something like the story where the saucy domestic at once determined to leave, with her mistress' finger pointing to the door. How anything can *' rise" in opposition to the laws of gravitation is not clear. A stick at the bottom of a bucket will not "rise," but when you fill the bucket with water we find the stick at the top. Popular phrase makes it "rise," but the man of science should know better. It is gravitation acting on the heavier and plastic water that results in pushing the stick up. It does not really "rise," but is pushed up. It is so with all liquids, the heavier pushes the lighter out of the way. The "heated air commences to rise" only when heavier air - that is, cooler air - pushes against it on all sides.

The cool air does not "follow," - it drives the other ahead of it. We think gardeners understand this pretty well. It is at the foundation of hot-water heating.