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not cumulative in its effects, 263. This influence modified by the refrigerating action of the planetary spaces, and the elevation of places above the level of the sea, 263, 264. The peculiar distribution of land and water, another cause productive of difference of temperature, 265. Leslie's experiments, 266. Experiments of M. Quetelet and others, 267, et seq. Daubuisson's experiments on. in mines of various depths, 270. Experiments of Mr. Fox, 271. Experiments on, in stratified rocks, by Saussure and others, 272. Experiments on, in Artesian wells, 276. Sir J. Herschel's theory of the variability of, 306. Hypotheses of various geologists accounting for changes of climate produced by solar heat, 305, 306, et seq.|1}}