The Journal of experimental zoology . er differences, the power of heat regulation is notdeveloped until long after the 10th day. Even at the age of eight-een days, the mean temperature of 3 mice, exposed to an atmos-pheric temperature of about 7°, was °, or 13° lower than that ofmice of the same age kept in the warm room. The temperatures of 348 FRANCIS B. SUMNER to Sa w S kJ => m o CO ^ ^ to CJ ^^ CO s o o f. rr. CO J S- o (M to H ?* o o CO CO (M ? CO o CO U5 CO ?* OS 00 to OS o o OO ?* t^ CO o s CO o cq in s s •* CO to « (M CO CO ?* o (M « CO s CO J:; Z .- C< ^ E a ci rt ^ H <;
The Journal of experimental zoology . er differences, the power of heat regulation is notdeveloped until long after the 10th day. Even at the age of eight-een days, the mean temperature of 3 mice, exposed to an atmos-pheric temperature of about 7°, was °, or 13° lower than that ofmice of the same age kept in the warm room. The temperatures of 348 FRANCIS B. SUMNER to Sa w S kJ => m o CO ^ ^ to CJ ^^ CO s o o f. rr. CO J S- o (M to H ?* o o CO CO (M ? CO o CO U5 CO ?* OS 00 to OS o o OO ?* t^ CO o s CO o cq in s s •* CO to « (M CO CO ?* o (M « CO s CO J:; Z .- C< ^ E a ci rt ^ H <; w ^ c5 Oi lO S t^ •e c^ •5o afterwarm 73 o J. a) -a8a o 3 oft M 0) a ?V fJ ^ Soo rectly from n Warm-room lo exposuie In i c a oo»-. a O 3 OP. £ a oo •A a aa § o ^ 3 o a a o a o oo o a 3 o ?a 1 (U 2 o O o JS s ^ M CO ?* in s 12; BODY TEMPERATURE OP MICE 349. s s s 3 o o o o o o £ 3 CO 3 o 00 o C! ^ <» O i. ^ ?~; V O O - Xi o o CO -1 , o o o ^ s >> -O o o bf ^ -ti ^ a ^ it! ni y IB O o GO bJO >! ?^ CO ;J +J o 1 CO Oh CI o o o o ^ -^ j: > 3 III 03C3 o ^^ -G c ?13 -i- CO o OJ C ,1* .i^ •^ hr o H a) -c 02 ^ O .ii 350 FRANCIS B. SUMNER these three mice seen, it is true, abnormally low, as will be realizedby inspecting the curve for this group as a whole, or by compar-ing it with the other curves of the same series. The warm-room mice which were tansferred to the cold roomseem to have nearly or quite attained their power of heat regula-tion at the age of sixteen days, though a small, constant differ-ence is thereafter manifested between this group and those testedin the warm room. • The very great variability shown even by mice of exactly thesame age is due in part to the size of the animals. Within eachexpermiental group, I hav
Size: 1163px × 2148px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913
