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1 From the Burroughs Wellcome & Co. U. S. A. Experimental Research Laboratories, Tuckahoe, New York
A statistical analysis of the duration of anesthesia caused by different doses of n-propyl-o-tolyl urea and sodium ethyl-n-hexylbarbiturate showed that the data were symmetrically distributed except for the lower doses of the barbiturate, that the relative degree of dispersion was more constant with the urea compound, and that variations between results obtained at different times of the year were significantly greater than would be expected from chance alone.
Some practical applications of these findings are discussed.
Submitted on May 7, 1938