Oysters And Disease An Account of Certain Observations Upon the Normal And Path
Oysters And Disease An Account of Certain Observations Upon the Normal And Path
W a William Abbott Herdman
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0036 1. 0948 0. 70 0. 60 0. 38 0. 33 Greenest parts 0. 0033 — 0. 0780 — — 4-23 — Whitest parts 0. 0009 — 0. 0452 — — 1. 99 The excessive quantity of copper in the selected green oysters is 3. 75 times that- in the white ones, calculated per oyster, and 3. 63 times calculated on the ash. In the selected parts the total copper present calculated on the ash is high in both cases, and the green parts again show a marked excess in the proportion of 2. 1 to i. The copper and iron in the white specime...ns are about normal, but the increased quantity of iron in the green is marked, being 2. 5 times that of the former. Still there is relatively a large excess of copper as compared with iron in the green oysters, as is evident from the analyses, the ratio being i. I : i for the white, and 1. 8 : i for the green. It is to be concluded, therefore, that the green colour of these diseased American oysters is coincident with the distribution of the excessive quantity of copper present, and that the copper is in consequence to be regarded as the cause of the colour.
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