150 EXPERIMENT STATION RECORD. 



tiou were introduced. The experimeuts were of several hours' duration 

 and covered periods of rest, labor, and sleep. The author was himself 

 the subject. His weight varied somewhat during the experiments, but 

 the results in every case are recalculated to a uniform weight of 70 kg. 

 The respiratory quotient was determined and the amount of water vapor 

 produced. Very careful records of the temperature were kept and the 

 amount of work performed was measured with an ergograph. Aliquot 

 samples of the external air and of the respired air were taken for 

 analysis by methods similar to those followed by Pettenkofer and Voit. 



Some of the conclusions reached are as follows: A room temperature 

 of between 5 and 25° exercised no particular influence upon the amount 

 of carbon dioxid excreted duriiig rest or when as much as 15,000 kilo- 

 grammeters of work per hour were performed. The amount of carbon 

 dioxid produced in sleep, rest, and labor (15,000 kilogramraeters jier 

 hour) was in the proportion of 4:5: 12, The amount of carbon dioxid 

 l^roduced per hour was increased about 50 gm. when 15,000 kilogram- 

 meters of work were performed j^er hour. When the same amount of 

 work was performed in an average temperature of 16°, 119 gm. of water 

 vapor were produced; when no work was performed, the temperature 

 being 22.5°, the amount of water vapor i>roduced was 42 gm.; daring 

 sleep, the mean temperature being 20.1°, the amount of water vapor 

 produced was 49.5 gm. 



Some practical deductions from the results of these experiments are 

 also made. 



The excretion of carbon dioxid and water vapor by individuals 

 of various trades during rest and work, H. Wolpert {Arch. Byg., 

 26, No. 1, pp. 68-108, dgms. 9). — Using the apparatus and follow- 

 ing the methods referred to in the previous abstract (p. 149), experi- 

 ments were made with shoemakers, seamstresses, a lithographer, a 

 mechanic, and men of several other trades. Tables are given which 

 show the amount of carbon dioxid and water vapor produced at rest 

 and at labor. The amounts produced by the people of various trades 

 are compared with each other and with the amounts i)roduced by the 

 author himself in the experiments reported in the previous article. 

 Assuming that 1 kilogram meter of work produced 3^ mg. of carbon 

 dioxid, the author calculated the amount of work performed by the 

 subjects. It ranged from 900 (seamstress) to 8,000 kilogrammeters 

 (shoemaker), in every case falling below the 15,000 kilogrammeters 

 performed by the author in the experiments of which he was the subject. 

 The practical ax)plication of his results is briefly discussed. 



Does muscular energy depend directly upon the energy of the 

 protein of the food? A. Chauveau and C. Contejean {Compt. 

 Bend., 122 [1896), No. 9, pp. 504-511, diag. 1). — Two sets of experiments 

 were made with a dog; in one the food consisted of meat and in the 

 other of gelatin. In each experiment there were periods of rest and of 



