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Table I. Copper, Nickel, and Cobalt Reported in Sea Water Micrograms per Lifer Reference Cu Ni Co (2) <3000 1.5-6 <0.3 (4) 4-10 0.1-0.5 0.1 (6) 0.7-0.8 0.38-0.67 (7) 2 (8) 0.23-0.32 (10) 20 3 1 (11) 13-22 0.33-0.67 other investigators. If the respective values of 18, 2, and 0.5 y per liter are accepted for copper, nickel, and cobalt in sea water, results of the present work indicate that copper and cobalt are concentrated in the oyster shell to nearly the same extent, 1.8 X 103 and 2 X 103,respectively.The concentration of nickel, however, from sea water to shell is appreciably higher at 1.5 X JO4.Copper in the edible portion of oysters has been reported by various workers to vary over the wide range of about 5 to 2000 p.p.m. in the living matter.A fair average of the compiled data of Vinogradov for Crassostrea virginica would be approximately 1100 p.p.m. of copper. As the edible portion of oysters contains about 87% water, it is evident that on the dry basis this part, even for the lower ranges of copper recorded in the literature, contains more of this element than found in the shell in the present study. The single reference to copper in oyster shells which was noted (9) gave a value of 25 p.p.m., which is close to the findings reported here.

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