The intestines and their contents taken from several lots ofStrongylus edentatusandS. vulgarishave been analysed and the amounts of certain metals and sulphur present have been estimated. Zinc was found to be the most plentiful metal present, reaching a maximum of 0·58 mgs. per worm. Copper, silver and iron were the other metals recorded.
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W. P. Rogers (1940) studied this question.
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