Letter | Published:

Lead and Animal Life


DR. GARRETT'S communication in NATURE of September 16, p. 380, on the effect of a lead salt on Lepidopterous larvæ, is particularly interesting to one who has been working on an allied subject. Recent investigations of my own on the fauna of lead-polluted streams in North Cardiganshire, as reported at the Hull meeting of the British Association, point to the presence of dissolved lead-salts in these rivers as distinctly inimical to the aquatic population, in particular to the larvæ of certain insect-groups, such as Trichoptera, which are normally non-existent in these streams, though well represented in their neighbours.

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