. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . me age geologically, the changes in the Desert Valley havebeen most rapid, and its complete dessication has long since been accomplished. This difference 1 Trans. Bombay Geographical Society, vol. ix, 1849-50, p. 39. s The results of the experiment upon the amount of evaporation were communicated in a paper road ln-fore the NationalInstitute, at Washington, March 4, 1856, and subsequently published in the American Journal of Science, May
. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . me age geologically, the changes in the Desert Valley havebeen most rapid, and its complete dessication has long since been accomplished. This difference 1 Trans. Bombay Geographical Society, vol. ix, 1849-50, p. 39. s The results of the experiment upon the amount of evaporation were communicated in a paper road ln-fore the NationalInstitute, at Washington, March 4, 1856, and subsequently published in the American Journal of Science, May, 1856. 196 GEOLOGY. of their present condition is attributable to the configuration of tbe regions. East of the TulareValley we find a lofty chain of snowy ranges, which condense the moisture in the winds fromthe Pacific on their summits, and send numerous streams into the valley for its irrigation. Ifthere was a similar high range east of the Desert, it is probable that sufficient water would be,in like manner, condensed on its summit, to form streams that would irrigate the Desert, as theTulares are now watered by the streams from the Sierra
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