Normal soil samples from British Columbia contain less than 0.05 ppm Hg. Soils from the vicinity of gold, molybdenum, and base-metal deposits contain 0.05 to 0.25 ppm, and locally 2 ppm. Soils around mercury deposits contain 1 to 10 ppm or more. Ash of first- and second-year growth of certain trees and plants may 'be considered normal if it carries between 1 and 10 ppm of mercury in mineralized areas, possibly anomalous if it runs from 10 to 20 ppm, and probably anomalous where it contains 20 ppm or more of mercury.' The ratio of mercury in plants to that in associated soils decreases with increasing total Hg.

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