[ 427 ] 
ceptibly the whole of that day, and the next morn** 
ing flood at gL. 
57. Another circumftance I was anxious to know, 
was, whether the hygrometer, after having been 
kept in the cellar fo long, would rife, upon being car- 
ried up flairs again, to the point from which it had 
fallen. The importance of this new obfervation 
prevented me from purfuing that I had begun in the 
cellar. I therefore took my hygrometer out of it, 
and while I was going up the flairs it rofe three de- 
grees. This was at fix o’clock in the morning. At 
feven it was already at 17, and at eight at 231. From 
eight to eleven it rofe to 43, and at one o’clock 
flood at 63. After this it fell again, and at half an 
hour after five was no higher than 50. The fky had 
been clouded during the laid; interval. 
As the preceding' obfervations relate only to the 
hygrometer, and not to humidity, I fhall confine 
myfelf to them. They are fufficient to give an idea 
of the going of the infirument in the feafon they 
were made. I fhall hereafter give an account of 
Tome obfervations taken at other feafons. 
FirstExperiments made to dif cover the Accuracy 
of this Instrument. 
5S. The moft important thing after the preceding 
obfervations, was, to try whether the infirument was 
in reality comparable. To afeertain this, I imme- 
diately conffcru 61 ed four more upon the fame prin- 
ciples, which were finifhed on the 23d of Auguft., 
59. I could not ufe my firft hygrometer to make 
comparative obfervations with the new ones j its tube 
Vol. LX 1 I 1 . K kk being 
