Mr. de Luc 
422 
of the irregularities attending all the phenomena, after some 
water has been once deposited on the sides of the vessel : mois- 
ture was too great for the temperature, and it remained in that 
state the whole evening. 
7,55' 28,82 0,6 96,5 52,75 
8,4 28,82 0,6 96,5 52.— 
But the next morning, after the dissipation of some dew 
that was on the inside of the vessel, and after having worked 
the pump, the instruments were found as follows. 
7,35' A. M. 29,12 0,6 97,66 44,75 
Now this, in respect of moisture, and its correspondence 
with the temperature by the maximum of evaporation, is sen- 
sibly the same, as when the receiver was filled with air at 
the beginning of the experiment, though at this time no sen- 
sible quantity of air remained in it. . 
SECOND EXPERIMENT. 
Every part of the apparatus was the same in this experi- 
ment as in the former, except the receiver, which was only 
about six inches in diameter, and eight in height ; to which 
circumstance may be assigned, that moisture was generally 
greater comparatively with the temperature ; but in respect 
of the indifference of air to the phenomena of moisture, the 
results were the same. 
A wet cloth, only sufficient to keep up the maximum of 
evaporation throughout the whole experiment, was used this 
time ; by which means no air appeared in the receiver after 
the disengagement of the little quantity contained in the 
small cloth. This was put under the receiver, filled with 
