Abstract
It is obviously impossible to draw any clear and absolute line of demarkation between climatology and meteorology; the two subjects occupy too much ground in common. Until a very few years ago most of us, nevertheless, had a perfectly clear idea of what we meant when we spoke of climatology as a separate and special field of study. We knew it as we know a path we have followed for years, without being able to reduce it to an equation in geographic coordinates—perhaps even without being able to describe it. But still we were able to follow it again and again without any danger of getting lost. Today our path to climatological knowledge has been confused by a number of newly erected road signs all bearing the same name and all pointing in different directions. One might almost suspect that it had been done deliberately, in order to confuse the “invading” sciences which come in search of the knowledge they need for the solution of their own problems.

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