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IT was shown in the first paper in this series (27) 2 that there was a marked difference in mean duration of life, and in the form of the curve, between wild-type stocks of Drosophila on the one hand and the syntheuic quintuple mutation stock on the other hand. It was further made clear that, because of the technique used in the experimental work, there could be no doubt that the basis of this difference must be hereditary and not environmental. Furthermore, Hyde (11) and Pearl (6) have presented evidence for the Mendelian inheritance of this character duration of life. Given it to be the fact, as the just cited work demonstrates to be the case, that there are hereditary differences within the same species of Drosophila in respect of duration of life, the problem which next presents itself is to determine whether within a particular strain of Drosophila hereditary differences exist, and if so what their magnitude may be, their degree of permanence, etc. In

Experimental Studies on the Duration of Life. II. Hereditary Differences in Duration of Life in Line-Bred Strains of Drosophila