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1 ZOÖLOGICAL LABORATORY, UNIVERSITY OF PENNSYLVANIA
1. Mosquito larvæ (Culex pipiens) were found to be extremely resistant to rather high concentrations of various acids.
2. The order of toxicity of the acids used is, salicylic > oxalic > HgCl > butyric > acetic.
3. The chemicals seem to penetrate the animal orally and not cutaneously.
4. Animals withstand rather high concentration of HgCl2, considerably in excess of that found for other organisms cited.
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