. Fig. 2. Moisture zonation, according to precipitation indices for period of average frostless season. Precipitation provinces: Humid, more than 140; semihumid, 100 to 140; semiarid, 60 to IOC; arid, lees than 60. Numerical values are in the thousandth of an inch. (See also plate 46.) Plates 48 and 51 show somewhat marked departures from this generalization, consisting mainly in the westward or southwestward displacement of the arid province, so that the latter comes to include the southern half or more of the Pacific coast and Uttle or none of the Great Basin. The other features of these two
. Fig. 2. Moisture zonation, according to precipitation indices for period of average frostless season. Precipitation provinces: Humid, more than 140; semihumid, 100 to 140; semiarid, 60 to IOC; arid, lees than 60. Numerical values are in the thousandth of an inch. (See also plate 46.) Plates 48 and 51 show somewhat marked departures from this generalization, consisting mainly in the westward or southwestward displacement of the arid province, so that the latter comes to include the southern half or more of the Pacific coast and Uttle or none of the Great Basin. The other features of these two plates are somewhat different from those of the other precipitation charts, but still agree ^vith them in a general way. The southeastern humid province appears on ])late 49 as three localized areas, two of which are where they would be expected (from a study of plates 46, 47, 49, 50, and 51). The third area, however, is diiTerently placed, occupying portions of Minnesota, Iowa, Mis- souri, Wisconsin, and Illinois. On plate 51 this southeastern humid, or rainy, region is much more extensive northward and northwestward
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphytoge, bookyear1921
