22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



because 1 erroneously thought the mean outside temperature was 

 considerably above 2? It is probable then that since the mean out- 

 side temperature was actually only i°5 above that of the measured 

 day, the wall temperatures of table B should have been several tenths 

 degree lower. As explained on pages 18 to 19, there is also another 

 correction to be made in table B, due to the difference Room Temp. — 

 Water Jacket Temp. This correction requires a lowering of the skin 

 and clothing temperatures of about the same magnitude as the wall 

 temperature correction just mentioned. It is a fortunate accident that 

 the dift'erence in temperature between the body surface and the walls 

 thus remains nearly the same and the mean radiation values in table B 

 remain unchanged. 



Table L compares the means of the two series, tables B and E. 

 The total radiation is greater in the first series due to the lower mean 

 room temperature. The adult basal metabolism (determined from 

 Du Bois' chart) is higher in the first series because the 3 adults were 

 two male and one female, average age 31, whereas in the second 

 series the adults were both female and average age 43. The work 

 of many investigators agrees in placing the basal metabolism per 

 sq. m. of body surface of adults considerably lower than that of chil- 

 dren. Yet the radiation losses in tables B and E show no such change 

 as between adults and children. In table L the ratios 



Radiation loss 



Basal metabolism 

 are in each case higher for adults than children. This is difficult to 

 explain. 



At normal indoor temperatures, in still air and with the subject 

 normally clothed and at rest, the major heat losses would be dis- 

 tributed as follows : The loss by evaporation of water from lungs and 

 skin (as stated by Du Bois, see page 14) is 24% of the total. The 

 convection loss, assuming it is similar to that of the cloth-covered 

 vertical calorimeter, is f of the radiation loss. Or, 



Water vapor loss = 24% of the total 

 Radiation loss =46% of the total 



Convection loss = 30% of the total 



It is interesting to compare this with a statement by Rubner (see 

 page 20, Leonard Hill, The Science of Ventilation and Open Air 

 Treatment) that " for an average man, in still air, the loss of heat 

 is distributed as follows : Warming of inspired air, 35 ; warming 

 the food, 42 ; evaporation of water, 55S ; convection loss, 823 ; radia- 

 tion, ii8t ; total loss, 2700 kg. calories." 



