Abstract
Samples of fluorides and fluosilicates representing the products of 14 manufacturers in the United States were examined chemically and microscopically. Both of these materials may be obtained in a satisfactory degree of purity. In solution all the fluosilicates give an acid reaction; whereas the sodium fluorides show a neutral or alkaline value. It is believed that the observed variations in the apparent toxicity to insects of different brands of commercial sodium fluosilicate are owing to factors other than variations in fluorine content. Variations in size of crystals cause variations in cubic inches per pound, dusting qualities, adhesiveness, and rate of solution, properties which greatly influence the efficacy of a dust insecticide. Variations in foliage-burning properties of different brands of commercial sodium fluosilicate are likewise probably the result of variations in crystal size.
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