" Is it a fact that the rainless region west of the Mississippi is gradually growing less in extent?" says a Pennsylvania correspondent.

[We do not know that it is a fact. We have not seen any figures of the rainfall which show that there is any change, and the mere belief of people is not "a fact." But there is reason to believe that before the Rocky Mountains were thrown up in comparatively modern geologic time, the " region west of the Mississippi" was moister than now. The moisture taken out from the atmosphere by the rocky peaks, and held as snow, would perhaps be spread over the whole dry region, if the mountains were not there. As the mountains crumble and are carried to the ocean, the height must lower, and we may imagine that a few feet of lower elevation might make a mile cy two of difference in the rain area of the level country beyond. It is safe to say that the rainless region must be gradually decreasing to some extent when we consider these facts. - Ed. G. M].