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8 G6 J8. AR SB. 6. 498 Azres 
Fic, 6.—Average temperatures 
for different periods, 
DR SUTHERLAND SIMPSON ON 
examination of the chart (figs. 1 and 2) will show that no 
such delay is apparent in the diurnal curve. The sharp 
morning rise is not any less abrupt on July 5 than it is, for 
example, on June 20.* The curve appears to obey local 
time and not Ithaca time. 
In order to get rid of accidental variations which might 
affect the body temperature on any one day, the average 
curve for each of the following periods is taken :—A, six 
days in Ithaca, immediately before setting out on the east- 
ward journey, from June 19 to 25 (omitting one day— 
24th—when the rectal temperature was distinctly above 
the usual level, due to a combination of muscular exercise 
and high external temperature); B, the first four days 
(June 27 to 30), and C, the last four days (July 1 to 4), 
of the voyage from New York to Edinburgh; D, five days 
immediately following arrival in Edinburgh (July 5 to 10, 
omitting 6th); EH, five days in the Orkney Islands about 
one week before starting westward (August 3 to 138, 
omitting 5th, 8th, 10th, 11th, and 12th); F, the first six 
(August 15 to 20), and G, the last six days (August 22 
to 27, omitting 24th) of the journey from Scotland to 
Winnipeg; H, one day and a half at Winnipeg (August 28 
till noon on 30th, omitting 29th); and lastly, I, the four 
days immediately following the return to Ithaca from 
Winnipeg (September 10 to 14, omitting 12th). In these 
average curves the rectal temperature only is considered. 
(See Table III.) 
From an examination of these nine mean curves 
(charts A to I, fig. 6) it will be seen that although there 
is considerable variation in their general characters, the 
most constant features, viz., the rise between 6 a.m. and 
9 a.m., and the fall from 9 p.m. to midnight, are fairly 
regular. Compare, for example, A, the Ithaca control, and 
(©, the mean of the last four days of the journey eastward. 
Except for the slightly smaller range of C, due probably 
to the less active life led on board ship, they very closely 
resemble each other. The first maximum is reached at 
* On two or three occasions in the control period at Ithaca the rapid rise 
from 8 a.m. to9 a.m. is associated with a walk up a rather steep hill after — 
breakfast in hot weather and shortly before the 9 o’clock observation was 
made. This is apt to give a wrong impression when comparing the curves at 
Ithaca with those obtained subsequently. 
