The amount of rainfall varies so vastly in different countries, that it would be tedious to the reader to enter upon a detail of the different amounts. In general it is greatest upon those portions of the land first reached by regular incoming sea winds. So in South America, Peru and southern Ecuador are practically without rain, as the Andes and the Amazon forests deprive the trade winds of their moisture ere they reach the Pacific coast; while southern Chili seldom sees the sun; lying in the track of the return trades, whose moisture is at once precipitated by the Andes. So in India the monsoon which pours deluges of water along the southwestern coasts, brings but twenty-three inches a year to the central plateau; and by the time Central Asia is reached, it is so dry the steppes of Tartary must remain almost a desert. And in our own land, we find in general the heaviest rain from the eastern coast to the central region: while the western plateau along the eastern slopes of the Rockies is unusually dry, and liable to protracted drouths: and in the Mojave desert, and in southeastern California, the rainfall is less than two inches per year. On the North Pacific coast the rainfall increases rapidly, as in the southern Andes; but in general our highest mean rainfall is in the southern portion of the Gulf States. The highest average in the world is so far credited to Sumatra, one hundred and thirty inches. This, of course, refers to tracts of considerable size; for a small tract in Assam, on a mountain slope, where is the town of Cherrapungee, has a rainfall of four hundred and ninety-three and two-tenth inches per annum--more than forty-one feet! Twenty-two feet of rain have fallen there in a single month! A better idea of this may be obtained by observing that our average rainfall, from Missouri eastward, is about three feet a year. The rains of the Amazon and Congo basins are enormous, and would suffice to swell our Mississippi to as great volume as either of them. On the other hand, the lowest recorded rainfall for a large tract is that of Greenland--fifteen and five-tenth inches; while Australia, with fifteen and seven-tenth inches, is but little better off. It may be mentioned here, that the term “mean rainfall” includes snow also: ten inches of snow being ordinarily estimated as one inch of rain. A point long mooted, now considered as definitely settled, was, the influence of forests upon rainfall. There was no doubt that forests retarded the descent of water into the streams, and so lessened the danger of floods; and observations of late years have shown that the forest also increases the amount of rainfall, aiding in the work of condensation. In the northern lumber regions, the rainfall in the cleared tracts is less than in the time of the forests, while floods are more sudden and dangerous.