Jl-8 



235 



25-9 



29-4 



334 



35-6 



8-59 



13-55 



14-74 



22-55 



29-36 



34-65 



3-90 



5-80 



9-68 



1590 



23-44 



22-00 



3-78 



7-75 



8-70 



14-95 



20-40 



24-63 



some Experiments in Climatological Physiology. 345 



The temperature range being small is, however, not very 

 satisfactory, although the results are determined from a 

 considerable number of means. 



If we take the results for absolute dryness in Table V., 

 w^ get a second degree curve and by no means identical 

 results. Combining the two series, however, which though 

 not quite satisfactoiy is probably better than depending 

 wholly on either, we obtain the following results : — 



Table VII 



Mean Temp. Group ... 20'0 218 



Absolute Dryness 6 - 13 



Loss for PC 1'33 



Calculated, as below ... 1*81 



Tf these be assumed to be of equal weight, the linear 

 equation which will represent them as well as any other 

 may be obtained by the method of least squares. This 

 solution gives the coefficient 0*793 instead of 0*955. Adopt- 

 ing 0*8 as sufficiently accurate, we obtain the calculated 

 results in line 4 in Table VII. above, that is again arbitrarily 

 assuming it to be independent of absolute temperature ; that 

 is to say, 



Loss in grammes for 1° C. = -3*09 + 0*8 £ 



In such results, however, it must be remembered that we 

 are not justified in assuming that the effect is not due in 

 part to increase of absolute temperature, and theoretical 

 considerations indicate that both temperature and saturation 

 deficit (or absolute dryness) influence the result. 



12. Deduction of Formula for Total Loss. 



The examination thus far would appear to indicate that 

 we may perhaps be able to interpret the data by assuming 

 that the loss is either the sum, or else the product of two 

 linear terms, one representing the losses due to temperature, 

 the other those due to dryness. Into these alternatives we 

 now inquire. 



It may be noted that though into saturated air of the 

 same temperature as the skin, or of a higher temperature, 

 there could be no evaporation from the skin, yet there would 

 still be a loss from the lungs. Ordinarily, therefore, we 



