The residue left on glass surfaces by human hands was found to be attractive to femaleAedes aegypti (L.) andAnopheles quadrimaculatus Say mosquitoes. The material lost half of its activity in 1 hr. A solvent wash technique was developed to recover and concentrate the residuum from handled glass beads. The residuum could be recovered effectively with absolute ethanol and less effectively with several other solvents. More mosquitoes were attracted to heated than to unheated residuum, an indication of its volatility. Also, attraction of the residuum decreased with decreasing concentration or dose. Concentrated residuum collections, stored under refrigeration and tested for longevity, showed no appreciable loss of attractiveness up to 60 days of storage.

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Three unsaturated straight-chain alcohols were prepared, their double bonds being, respectively, two, three, and four carbon atoms removed from the carbinol carbon. The bromides of the respective alcohols were made; the physical constants of the hitherto unreported 5-hexen-1-01 and 1-bromohexene-5 were determined and they were characterized. The physical constants of the three new sulfides derived from the bromides were determined and these new compounds were characterized. Attempted syntheses of the three tris-sulfonium bromides were made. An attempt is made to explain the fact that the expected products were not obtained. Except for the tris(3-buteny1)sulfonium bromide-mercuric iodide, which could not be isolated, the eight new double salts of the tris(3-butenyl), -(4pentenyl), and -(&hexenyl) sulfonium bromides and, respectively, mercuric chloride, mercuric bromide, and mercuric iodide were made. Their physical states are reported and their respective constitutions were established by analysis. The effect of moving the double bond farther from the sulfur was an increase in the stability of the compound.

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