142 



Scientific Proceedings (67). 



students at the College of the City of New York or at New York 

 University, and in the last two series young women. For five 

 days a week for a period of from two to six weeks, they were placed 

 in the observation room of the experimental plant at the College 

 of the City of New York (described Proc. Soc. Exp. Biol., Vol. XII, 

 p. 111). In each series of experiments the subjects were supplied 

 with a fresh air supply of 45 cubic feet per minute on half the 

 days while on the other days no air was supplied and (subject to 

 unavoidable leakage through walls and ceiling) the carbon dioxide, 

 organic matter, and whatever else was given off from mouths, 

 bodies, and clothing accumulated in the room. Temperature and 

 humidity however, were controlled so as to be the same on both 

 ventilation and no-ventilation days. In the last three series 

 of experiments, three desk fans were kept in motion at all times 

 so as to prevent the introduction of an air movement factor by 

 the current from the inlet duct on the ventilation days. 



After the subjects had been in the room for from 2 to 3 hours, 

 a luncheon made up of weighed portions of known calorific value, 

 was served and the amount of food left uneaten was weighed to 

 determine by difference the amount consumed. The diet was 

 varied from day to day but with the exception of Series III was 

 so arranged that each article of food appeared an equal number of 

 times on the ventilation and no-ventilation days. 



TABLE I. 



Series. 



Date. 



No. of 

 Subjects. 



M 

 l; 



t/3 



No. of Days. 



Hours 

 in 



Cham- 

 ber 



before 



Lunch. 



Average 

 C0 2 at 

 End. 



Average 

 Calories Con- 

 sumed. 



Excess 

 Favoring 

 Ventil. Day. 



Vent. 



No 

 Vent. 



Vent. 



No 

 Vent. 



Cal. 



i 



III. 



June 8-July 27 '14 



4 



M 



18 



3-3 Yi 



7-5 



29-5 



1,308 



I.I5I 



157 



13.6 



VII. 



Oct. 12-Nov. 6 



4 



M 



20 



3 



9.0 



SO 



1,620 



1,492 



128 



8.6 



X. 



Dec. 8-Jan. 29 '15 



7 



M 



28 



2Vi 



9-5 



36 



2,057 



1,971 



86 



4.4 



XI." 



Feb. 1-19 



8 



F 



12 



2M 



7.0 



37-5 



I.3I3 



I.38I 



—68 



—4.9 



XII. 



Feb. 22-Mar. 19. 



8 



F 



20 



2M 



10. 0 



37-5 



956 



895 



61 



6.8 



The carbon dioxide as indicated in the table above averaged 

 between 29 and 50 parts on the no-ventilation days and there 

 was usually a slight odor noticeable and sometimes a strong one. 



In Series XII the opinions of the subject as to comfort were 

 recorded and the average expression favored the no-ventilation 

 condition. 



1 This series was vitiated by special conditions noted below. 



