1871.] Effect of Exercise upon the Bodily Temperature. 289 



The author compares this formula with sixty-two of M. Darcy's experi- 

 ments, and records the results of this comparison in the last three Tables 

 of his paper. 



The paper concludes with an investigation of the rise in the temperature 

 of a liquid flowing through a pipe caused by the resistances which its 

 coaxial films oppose to their motions on one another (or* as it is termed, 

 their frictions on one another) and on the internal surface of the pipe. 

 The pipe is in this investigation supposed to be of a perfectly non-con- 

 ducting substance. 



Februarij 9, 1871. 

 General Sir EDWARD SABINE, K.C.B., President, in the Chair. 

 The following communications were read :■ — 



I. " On the Effect of Exercise upon the Bodily Temperature." By T. 

 Clifford Allbutt, M.A., M.D. Cantab., E.L.S., Member of the 

 Alpine Club, &c. Communicated by Mr. Busk. Received 

 November 12, 1870. 



(Abstract.) 



The object of the author in carrying out the experiments recorded in the 

 present paper was to inquire whether the regulating-power of the organism 

 held good under great variations of muscular exertion. For this purpose 

 he made frequent daily examinations of his own temperatures during a 

 short walking tour in Switzerland, and found that the effect of continuous 

 muscular exertion upon himself was to sharpen the curve of daily varia- 

 tion — the culmination being one or two tenths higher than usual, and the 

 evening fall coming on more rapidly and somewhat earlier. Charts of the 

 daily temperatures were handed in with the paper. The author made r&- 

 ference also to some observations of M. Lortet, which differed from his 

 own. These observations, which did not come into Dr. Clifford Allbutt's 

 hands until his own experiments were partially completed, were adduced 

 by M. Lortet to prove that the human body was very defective in regu- 

 lating-power under the demands of the combustion needed to supply the 

 force expended in muscular exertion. Dr. Clifford Allbutt's results were 

 very decidedly opposed to those of M. Lortet ; for only on two occasions 

 did he note the depressions of temperature which M. Lortet regards as 

 constant. It would seem, however, that the body is more or less liable 

 to such depressions when engaged in muscular exertion ; but the cause of 

 them is very- obscure. Of the two low temperatures noted by the author, 

 one occurred during a very easy ascent of lower slopes, and the second was 

 observed during a descent. The author think3 that they may be due to 

 some accidental deficiency in combustion, and inquires whether the capa- 

 city of the chest in different individuals may account for the varying in- 



