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33* It was obfervable, that the water diftiiled fail, 
. even though the water in the flill was below the fur- 
face of the tin air-box, through which the greateft 
part of the afcending fhower of air rufhed. Hence 
the ventilating air, in afcending among the vapours, 
. carries them off fall. Hence it is to be fufpedted, 
that this method of ventilation will not do well for 
■ limple waters, or fermented vinous fpirits; becaufe 
they being very volatile, much of them may be car- 
ried off in wafte. 
3+. .It was obfervable, that in thefe diftillations of 
fea- water, no whitifh clouds appeared on dropping 
in folution of corrofive mercury, not even when 
confiderahly more than four parts in five of the wa- 
ter had been diftilled over. And it was the fame 
with the mixture of lapis infernalis, lime, and 
chalk i whence it is probable, that the lime and 
chalk feize on and fix the more volatile bittern fait, 
as does alfo the lime in the lapis infernalis. And it 
is well known, that fugar, that fwect fait, cannot 
be made without lime, on which, as its centre of 
union, it fixes and granulates. 
3 y. And whereas with a folution of filver in aqua- 
fortis, which was much weakened and diluted with 
water, there appeared a faint degree of whitifh cloud, 
in all the above-mentioned diftillations, though not 
with the ftronger folution of mercury, till the diftil- 
lation was 'Carried on, much beyond four parts in five 
'Of the water in the flill ; when both folutions caufed 
.remarkably white clouds, efpecially the folution of 
mercury ; which indicates the quantity of the fpirit 
4of fait which was raifed during the former part of 
.the diflillation to be exceeding fmall, fince it could 
not 
