SL a aA re 
ee ae 
liberal fupply of air to the flame. To determine whether this 
was really the cafe, we caufed a ftopper to be made half an inch 
in diameter, which, fitting into the central aperture with a fpring, 
left a circular opening 3ths of an inch wide for the paflage of air. 
We then Plerved with a thermometer and ftop-watch at what 
rate mercury contained in a glafs folution bottle, which was placed 
in the laboratory, acquired temperature, firft, when the ftopper 
was not employed, and, afterwards, when it was. ‘The bottom of 
the veffel was one inch and ths diftant from the edge of the 
wick-holder. 
Tue refult of thefe obfervations is contained in the following 
table. At the beginning of obfervation the thermometer placed 
in the mercury ftood at 113,5. 
. Without ftopper. 
Increments of 
Minutes of obfervation. Temperatures. Temperature in a minute. 
re - 143,55 =<) 130 
2 ip in 174 va 3955 
3 F ; BOG ihe h Ft 29 
4 - - 28 - 28 
Be ihe - 256 = - 25——142,5 in 5° 
The — 
