1912] PEIRCE—RESPIRATION 93 
The graphic representation of these figures, as in the accompany- 
ing curves (figs. 3 and 4), indicates more plainly the different 
degrees of efficiency as insulators possessed by different flasks, even 
| of the same manufacture. The record of flask 14 with thermom- 
eter 6, in fig. 4, shows very strikingly the part played by the 
. 
, 
vacuum as an insulator between the two silvered walls of these 
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3-—Graphic representations of temperatures in silvered Dewar flasks and in 
the laboratory. 
double-walled flasks, for I cracked this just after pouring in the 
warm water. Although I kept the water in the inner flask, the 
vacuum surrounding it was destroyed. The temperature fell to 
approximately that of the room, almost as rapidly as in a single- 
walled unsilvered vessel. For obvious reasons, the rate of fall in 
temperature is most rapid when there is the greatest difference in 
the temperatures within and without the flask. This fact is impor- 
