[ 2o8 ] 
index was between 15° and 25'’ in the open air j 
that at 40° the atmofphere felt very fcnfibJy moid j 
but yet it was frequently above 60° j and more than 
once at 70°, or very near, I have therefore marked 
the point of o dry \ 20® the mean^ 40° 70® 
very mojiy 1 00° wet. I do not, however, mean thofe 
words (that of dry and wet excepted) as of any 
'other intent, than that of general diredtion, in like 
manner as thofe upon the barometer j leaving the 
relative degrees of moidure to be judged of by the 
fcale. 
In the month of January lad, I redored the ex- 
pofed hygrometer to its former place in the daircafe, 
when both indruments were again compared together j 
and they rarely didered more than i degree, and never 
fo much as 2°. After this, they were both removed 
together to the out padage 3 and there they agreed 
nearly in the fame manner, the utmod difference not 
exceeding 2 degrees. After fome tryal here, one of 
them was readjuded, leaving the other hanging in 
its place. On redoring the new adjuded indru- 
ment to the other, they now differed about 5°, the 
new adjuded one danding fo much higher. The 
day following the^ other was readjuded alfo, and 
afterwards redored to its place with the former, 
which had been left in the out padage ; and after 
this readjudment they both agreed to 1°. This be- 
ing obferved for fome days, one of them was taken 
down, in order to be packed up for London ; 
this I have now the honour of exhibiting to the 
Royal Society ; and I beg to leave it in the 
Society’s houfe, that in cafe any one diould be 
defirous 
