304 Experiments in diffolving Lea. VII. 
the Winds, or otherwife, are carryed into it; and fo caufeth it to 
prefs upon the Mercury in the Box : but after that in fome time the 
Salts are diffolved or incorporated in the Aqueous Parts of the Aer, as 
in Rain or Snows fo foon as that is done,there is fome Space gainds and 
fo, before any Weather falleth, the Aer is lef crowded, and prefleth 4 
Jefs upon the Mercury in the Box, which gives way to its defcent in 
the Cylinder, | 
5. $. From hence alfo it is, that the Mercury rifeth higher with 
Cold Winds, than it doth with thofe which are Warme. Both becaufe 
that in cold Winds there is the greateft quantity of Nitre: and that the 
coldeft Winds, are ufually the dryeft. So that the Nitre wanting 
Moyflure fully to diffolve it; it takes up fo much the greater fpace, and 
fo caufeth a greater preflure in the Aer, as hath been faid. C 
6. $. Lafily, For the fame reafon it comes to país, that the Mer- 
cary firfk rifech higher, and then falleth lower before Sow, than it doth 
before Ram. Becaufe that for the produdion of Snow, the Aer is 
crowded with a greater quantity of Nitre, or fome other like Sulit; | Id 
which before they are diflolved, take up fo much the more fpace 5 h 
and afterwards fo much the lefs, even before the Snow falls: as hath 
been proved. 
Bid Naas. 
