some 



Experiments in Climatological Physiology, 



;35 



which air-disturbance would vitiate even more than in the 

 case considered by Stefan. They thus suggest that the area 

 and not the mass of a body should be the quantity used in 

 comparing results from different human beings. See, how- 

 ever, the result hereunder. 



Two persons similarly built, differing only in linear dimen- 

 sions, would weigh as the cubes of any common measure- 

 ment (<?. g. their height), while the surface of their bodies 

 would vary as the square of the common measurement. If, 

 therefore, we regard the loss as occurring mainly by evapo- 

 ration from the skin-surface, it should vary, other things 

 being equal, as a function of the weight (lying between say 

 the frd power to the Ard power, most closely approximating 

 to the former), because of air-disturbances which make the 

 evaporation from each part comparable to that of any other 

 part. Hence we should regard the factor to determine the 

 absolute loss not as W, the weight of the person, but rather 

 as a quantity approaching W s . 



This may be roughly tested by the experiments with 

 W. A. 0. and A. G. (which, however, do not give the index 

 two-thirds but give one-third) as follows : — 



First eliminating all observations which appear to give- 

 results divergent from the general trend, we have the follow- 

 ing for the body -weights 46 and 68 kilograms, viz. : — 



Table II. 



Weight of body 46 kilos. 



Weight of body 68 kilos. 



m -n Loss in 

 lemp. Dryness. 



v } grammes. 



17-0 -324 47 



Temp. Dryness. Loss in 

 r J grammes. 



17*3 '338 50 



22-8 -492 61 



23-3 -674 72 



23-9 -735 55 



23-9 -630 76 



30-5 -733 123 



292 -728 152 



35-7 -796 181 



340 -742 230 



33-3 -805 212 



37-2 -819 254 



Mean 280 '647 1132 



27-5 -655 1290 



(LessC4-H 2 O=22-0)= 912 



(Less C+H a O=22-0) = 1070 



91'2: 107-0=1: 1*173, 46:68 =1 : 1478, 



1132 : 129-0=1 : M38, (46 ; 68)3=1 : 1139 



(46:68)3=1:1-297. 



It will be seen from these results that, so far as they may 

 be relied upon, the loss is not as the weights, nor even as the 



