WHICH IS CONDENSED ON A COLD SURFACE. 305 
REMARKS ON TABLE I. 
The experiments, the results of which are contained in this table, were all 
consecutive. No experiment was rejected after what appeared to be a satisfac- 
tory mode of experimenting had once been adopted. 
The indications of the barometer in the fourth column are reduced to 32° Fahr. 
The indications of the dry and wet bulb thermometers recorded in the fifth 
and sixth columns, are the means of observations made during the intervals of 
the experiments. As the moist-bulb thermometer was observed in calm air, it 
was necessary to apply to its indication a subtractive correction, the amount of 
which was determined by ascertaining, at the end of each day's experiments, how 
much the moist-bulb was cooled by fanning it for a short time. 
The tenth column exhibits the weight of the condensing vessel with its lid. 
Tt was found that the friction used in drying the vessel reduced its weight by 
about -01 of a grain at each experiment. In order to make the suitable correc- 
tion on this account, the vessel was weighed at the beginning and end of each 
day’s experiments, and the loss of weight was equally distributed over the inter- 
vening experiments. The numbers marked with a cross thus +, express the 
weights which were actually determined. 
