Editing James Hutton (section)

===Meteorology===
It was not merely the earth to which Hutton directed his attention. He had long studied the changes of the [[Earth's atmosphere|atmosphere]]. The same volume in which his ''[[Theory of the Earth]]'' appeared contained also a ''Theory of Rain''. He contended that the amount of moisture which the air can retain in [[Solution (chemistry)|solution]] increases with temperature, and, therefore, that on the mixture of two masses of air of different temperatures a portion of the moisture must be condensed and appear in visible form. He investigated the available data regarding rainfall and [[climate]] in different regions of the globe, and came to the conclusion that the rainfall is regulated by the [[humidity]] of the air on the one hand, and mixing of different [[air current]]s in the higher atmosphere on the other.