[ 4<5o ] 
winter’s day; but there will be lefs of it will 
adt upon the hygrometer; and yet as the adtive part 
will have more ftrength, the effedt upon the whole 
will be the fame. This is what appears to me, but I 
can not now enlarge any farther on this fyftem- 1 
have faid enough to fhew that the fubjedt is very ex* 
jpenfive, and deferves an attentive examination*. 
XXXIX. Of 
