22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



subjects were compelled to go out. The workers stood 8 to 14 per 

 cent no better than the experimenters. 



In the Albion Brewery, Whitechapel (Mann, Crossman & Co.), 

 we analyzed on three different days the air of the room where the 

 CO a , generated in the vats, is compressed and bottled as liquid 

 carbonic acid. Work goes on night and day; 18 tons of liquid C0 2 

 are sold per week; three men work per shift. We found from 0.14 

 to 0.93 per cent of C0 2 in the atmosphere of that room. The men 

 who were filling the cylinders and turning the taps on and off to 

 allow escape of air must often breathe more than this. The men 

 engaged in this occupation worked twelve-hour shifts, having their 

 meals in the room. Some had followed the same employment for 

 eighteen years, and without detriment to their health. It is only 

 when the higher concentrations of C0 2 are breathed, such as 3 to 4 

 per cent of an atmosphere, that the respiration is increased so that 

 it is noticeable to the individual himself ; such percentages diminish 

 the power to do muscular work, for the excess of CO, produced by 

 the work adds its effect to that of the excess in the air, and the 

 limit of panting is soon reached. 



ALBION BREWERY 

 C0 3 Compression Room 



Sample taken Per cent CO» 



Jan. 10, 1912, morning At breathing level 0.3 



Near cylinder from which air (and C(X>) 



was escaping during filling process 1.4S 



At another part of the room 0.44 



Jan. 10, afternoon At breathing level 0.54 



Near cylinders" in foreman's office 0.39 



In center of room about 20 minutes after 



blowing off cylinders 0.79 



Ditto a few minutes after blowing off cylin- 

 ders 0.93 



Jan. 12 In the middle of the room, no taps open for 



some time 0.196 



Near cylinders 0.345 



In foreman's office 0.142 



In middle of room after blowing off cylinders, 



at breathing level 0.533 



Haldane and Priestley found that with a pressure of 2 per cent of 

 an atmosphere of C0 2 in the inspired air the pulmonary ventilation 

 was increased 50 per cent ; with 3 per cent, about 100 per cent ; 

 with 4 per cent, about 200 per cent; with 5 per cent, about 300 per 



