DAILY ROUTINE AND BODY TEMPERATURE. 261 
should have been delayed till 12 (noon) in Edinburgh, if the Ithaca rhythm were fixed 
in the body of the subject. ‘This was found not to be the case. In the eastward 
voyage, which occupied eight days, there was an immediate adjustment of the 
temperature rhythm to the changed routine day by day, and the same was found to 
occur on the westward journey from Edinburgh to Winnipeg, between which stations 
there exists a difference of over six hours in time. 
It was also found that the temperature curve can be almost obliterated by remaining 
in bed and enforcing muscular rest during the whole twenty-four hour period, at the 
same time abstaining from food. This was practised in Scotland, in Winnipeg, and 
in Ithaca. Any temperature rhythm inherent in the body might be expected to show 
itself under these conditions, and, if persistent, to be carried from one locality to the 
others. This was found not to be the case. The curves obtained at the above- 
mentioned stations, with time differences as already indicated, resemble each other 
very closely, and differ only in minor details. 
The results of the present investigation, therefore, give strong support to the 
conclusions of Gipson, LINDHARD, and Simpson and GALBRAITH, viz. that the diurnal 
variation of body temperature, in man as in other animals, is determined by the 
conditions imposed on the body, such as rest and activity, and is not an expression 
of any inherent periodicity established in the body. 
