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68. Some fea- water, which was made to fHnk 
with fleih and ifmglafs being put into it, was not 
made perfectly fweet, not even by a ventilated diftil- 
lation, and an hour’s more ventilation after it was 
diftilled ; fo that putrefaction with animal fubftances 
is not ealily completely cured by ventilation. 
69. When the water was 27 inches deep in the 
leaden veffel, no air could be blown up through it 
by the force of the bellows. But at 18 inches depth 
the air could freely be blown up in fhowers, thro’ 
the water ; when therefore it is requifite to blow up 
through great depths of water, the bellows may be 
worked with a lever, as fmiths bellows are worked. 
70. As it is found by experience, that the milk 
and butter of cows, which drink ftinking water, has 
a very bad tafte, this plainly (hews, that the water 
retains its putrid quality, when mixed with the blood. 
Whence it is much to be fufpeCted, that the ftinking 
water, which is drank in (hips, by retaining its putrid 
quality, even when mixed with the blood, may there- 
by promote that putrid diftemper the fcurvy, as well 
as fome other diftempers. And much more does the 
putrid clofe air in ftiips, which is mixed with the 
blood from the lungs, promote putrid and other 
diforders. By the fame means alfo peftilential in- 
fections are taken in : For as the falutary properties 
of good air are conveyed by the lungs, fo are alfo the 
malignant qualities of bad air. 
71. Thus alfo the putrid water in marfhy aguifti 
countries, may be a caufe of agues, as well as the 
putrid air, which they breathe ; which, as well as 
the putrid water, may probably carry fome of its 
putrid quality into the blood through the lungs. 
V0L.49. Yy This 
