250 DR SUTHERLAND SIMPSON ON 
records obtained at Winnipeg on August 29—with the subject resting in bed and fasting, 
as in the Orkneys on August 8—when plotted out should give a curve different from 
that found in Scotland: the morning rise as well as the late evening fall should appear 
some six hours earlier in the Winnipeg than in the Orkney curve. Such, however, 
is not the case. The morning ascent, to be sure, is slightly less abrupt in the Winnipeg 
curve, but this may be accounted for by the fact that here the subject was allowed 
to remain quite undisturbed, whereas on August 8 he was persistently invited to 
partake of some breakfast by kind but injudicious friends. 
There is no evidence of any persistence of the Ithaca contro] type of curve in 
Scotland, nor of the Scottish type in Winnipeg. In the westward as in the eastward 
journey there appears to be an immediate adjustment of the temperature rhythm to 
the changing daily routine, so that in this respect the results agree entirely with those 
obtained by Grgson. 
V. Errecr or Muscutar Rest anp Activiry on Bopy TEMPERATURE. 
After plotting out the curves for the rectal-temperature readings taken on August 8 
and 29, 1 was struck with the marked effect which complete rest in bed has on the 
diurnal body-temperature variation, and to test this further, | made experiments 
under nearly similar conditions on myself on three occasions after returning to Ithaca 
(September 12 and 13, 26 and 27, and October 3 and 4) and twice on two other 
individuals (November 27, 28, and 29, and January 29, 30, and 31). 
On September 12 I stayed in bed all day, z.e. from 12.15 a.m. till 7 a.m. on the 13th, 
and, as on August 8 and 29, endeavoured to make as few movements as possible, but 
on this occasion I had the usual three meals, taken in bed in the recumbent position— 
breakfast at 9.30 a.m., lunch at 1.30 p.m., and dinner at 6.30 p.m. The temperature — 
of the room rose steadily from about 16° C. at 6 a.m. to 22° C. at 7 p.m., and then fell 
to 19° C. at midnight. Such changes in the outside temperature, however, in the case 
of a person in bed and covered with blankets, are of little importance, except as affecting 
the temperature of the mouth (fig. 9). 
On September 26 the same experiment was repeated, with this difference, that no 
food was taken from 9.30 p.m. on the 25th till 8 a.m. on the 27th. The bed on 
this occasion was outside on the verandah, and the air-temperature range was from 
6° C. at 6 am. to 22° C. at 4 p.m., after which it fell regularly till midnight, when 
the thermometer stood at 8° C. (fig. 10). ‘¥ 
On the following Sunday (October 3) I again remained in bed on the verandah, — 
but had breakfast at 9 a.m., lunch at 2.30 p.m., and dinner at 6.30 p.m. ‘The air 
temperature was about 10° C., and varied little throughout the day (fig. 11). 
Wishing to ascertain how this modification of the daily routine would affect the — 
diurnal temperature variation in other individuals, I prevailed on Miss A. B. and 
Mr X. Y., workers in the laboratory, to make similar experiments on themselves, and 
