130 CARNEGIE INSTITUTION OF WASHINGTON. 



vapor when illuminated with approximately monochromatic light, 

 and some very remarkable relations between the wave-lengths of the 

 absorbed and emitted radiation were found, which, it is believed, 

 will eventually throw a great deal of light on the problem of fluo- 

 rescence, for which we have at the present time no satisfactory 

 theory. The work was suspended early in December, owing to the 

 insufficient power of the spectroscope employed, but will be renewed 

 again as soon as suitable apparatus can be constructed. 



PHYSIOLOGY. 



W. O. Atwater, Wesleyan University, Middletown, Conn. Grants 

 Nos. 134, 139, and 195. For investigations iti nntrition. (For 

 first report see Year Book No. 2, p. xxxix.) $7,000. 



Abstract of Report. — The purpose of this grant was to promote re- 

 search involving the direct determination of the amount of oxygen 

 consumed by man for sustaining bodily functions. To this end a 

 considerable portion of the fund was devoted to the development of 

 an apparatus and method for determining the amount of oxygen in 

 connection with the respiration calorimeter alread}- in use. 



Between October i, 1903, and January i, 1904, the work was con- 

 tinued and frequent tests of the efficiency of the apparatus were 

 made. In addition to these, a very successful experiment with man 

 was completed. The work of the year was thus more satisfactory^ 

 in respect to both the development of the apparatus and method 

 and the experiments actually accomplished with men than had been 

 anticipated at the beginning. 



For the year 1904 three grants have been made — No. 134 of 

 $1,000, No. 139 of $4,000, and No. 195 of $2,000 — of which the 

 first two were for the continuation of the work already begun and 

 the last was intended more especially for experiments in fasting. 

 The work under these grants is still in progress. 



Despite some exceptional difficulties, a number of very successful 

 experiments have been carried out since January i. These have 

 included: 



(i) General metabolism experiments with men, in which the 

 effects of muscular work have been studied. 



(2) A number of shorter and less complete experiments of ap- 

 proximately 12 hours' duration with several men to determine the 

 heat emission and oxygen consumption, as well as the elimination 

 of carbon dioxide and water under varying conditions of bodily 

 position, muscular work, and amount of clothing. 



