. Fig. 18.—Moisture-temperature zonation, according to moisturo-tomporaturo products: (physio- logical method) for period of average frostlcss season. Moisture-temperature provinces: Very hioh, more than 13; high, 7 to 13; medium, 4 to 7; loir, 1 to 4; very low, less than 1. Nu- merical values represent thousands. (See also Plate 72.)

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphytoge, bookyear1921