Journal of experimental zoology . oflife, warm-room animals of a given body length are heavier thancold-room animals, and this is true of both sexes. Unfortu-nately, I have but few other data indicating the relative weightof mice of equal size which have been reared at low and hightemperatures. As has already been stated, the other (super-fluous) males of this lot, which w^ere killed at the age of fourmonths, showed a reverse difference, though of smaller my experiments of earlier years (1907 and 1908), no compari-son was made by size-groups, but, so far as may be judged fromthe gros
Journal of experimental zoology . oflife, warm-room animals of a given body length are heavier thancold-room animals, and this is true of both sexes. Unfortu-nately, I have but few other data indicating the relative weightof mice of equal size which have been reared at low and hightemperatures. As has already been stated, the other (super-fluous) males of this lot, which w^ere killed at the age of fourmonths, showed a reverse difference, though of smaller my experiments of earlier years (1907 and 1908), no compari-son was made by size-groups, but, so far as may be judged fromthe gross averages, the conditions were contradictory in differentlots. But whether or not there be shown any general effectof temperatm-e upon the relative body weight of mice, it mustbe borne in mind that in the breeding animals of both sexesamjong the Bi lot (, the parents of the various C broods),the warm-room animals were heavier relatively as well asabsolutely. INFLUENCE, HEREDITY, CORRELATION, GROWTH 369 Foot Tni 908988. 88 AdulT by Body Lencjlh A GenerationB Warm as 86 87 86 69 90 91 92 S3 94 SP se. 97 93 99 100 101 lOZ I03 104 105 Figure 5 Figures 5 and 6 permit of a comparison between the warm-room and cold-room sections of the Bi females, figure 5 like-wise including curves for the females of the A generation (bothsections combined). These figures agree with the table in 370 FRANCIS B. SUMNER Hair. 40 090SO70&0SO4030EOI O 30090SO7060504030EOI O ECO ISO 242322 I 7I 6
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