VOL. 28, NO. 4 480 INDUSTRIAL AND ENGINEERIKG CHEMISTRY 2. Based on the creosote concentration in the outer halfinch of sapwood as 100 per cent, the average distribution of creosote in nineteen poles was such that the amounts of creosote present in successive layers, a half-inch thick, were 80, 53, 35, and 22 per cent, respectively.Based on the green volume, the average density of the toluene-extracted summerwood from 159 annual rings was 0.701 with a standard deviation of 0.0560, and the average density of the toluene-extracted springwood from the same annual rings was 0.329 with a standard deviation of 0.0366.

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MANYliquids which show a tendency to foam under distillation at atmospheric pressures can be controlled by the addition of a small quantity of amyl, capryl, or some other alcohol of high molecular weight. Even under slightly reduced pressure these alcohols can be used to good advantage but, when pressures of 1 to 2 mm. or less are used, their value as foam preventers is greatly reduced, if not entirely lost.An experiment conducted recently by the writer required that a solution having foaming tendencies be distilled at a pressure of from 1 to 2 mm. to avoid decomposition. The apparatus used for the distillation was a 2-gallon, steamjacketed, hemispherical, glass-domed still, surmounted by a short distilling head, which in turn was attached to the usual condenser arrangement. The ordinary short distilling head permitted only slow distillation with no aid in fractionating the abundant foam produced by the liquid when distillation was in progress.