84 M E M O 1 R S of the 
Cor. 5. Volatile falts are very powerful in exira<5^ing tin^lnres, 
and particularly in heightening thofe colours, which are difpoled 1 
to be red; for tho' fpirit of wine be a very catholic Merifiruumy 
and draws a very deep tinifture of cochineel, yet it has been often 1| 
oblerved, that if we put to this tin^iute, when higheft, a fmall I 
proportion of volatile fait, it will be advanced to a great, 
even to a double degree ^ and thus Dr. Slare oblerved it to 
heighten the colour of arterial blood 5 and which is very curious, 
if you diffolve it m your blood, whilfl: bleeding at a vein, that 
blood will become very florid, and like the arterial ; therefore, 
fince nitrous falts produce none of thele tinging eflcfls, this corol- 
lary fcems much to favour the notion, that the efFc6ls of the air 
on the blood, may be due to fuch falts as are of a volatile alcali- 
fate nature. 
Cor. 4. Contagious diieafes are communicated by the air in 
infpiration, which feems more probable than b\ the air we take in 
with our food, becaufe of the Imallnefsof the quantity, if compared 
with what we take in by the lungs. 
'Tbs ^rej]ure of Water hi fever al Depths 5 ani a Well 
tloAt floii'i and, ebbsj by iZ^r. Oliver. Phil. TranL N° 204. 
p. 908. 
IN thrbay o^ jBifca}\ in a hundred fathoms of water, a quart 
glafi-bottle, flopped with a large cork, and afterwards tied 
down with aftrorg packthread, was faftcncd to a rope, and with 
a lead at the end lunk to the bottom of the fea ; upon drawing 
it up again, the cork was found quite prefled thro' the neck 
of the bottle into its cavity, and the bottle full of Iklt fea- watery 
the experiment was repeated with another bottle and cork in the 
lame manner as before, but the cork not proving Ibund, the fea- 
water foaked thro' it, ard the bottle was half full of water 5 fo 
the cork remained in the mouth of the bottle, without being 
preficd down at all; the experiment was repeated a third 
time in ninety fathoms of water, with a very ibund cork, and 
much larger than the mouth of the bottle, for it wavS forced ■ 
down with a hammer as far as it would go, leaving about an 
inch of the cork above the mouth of the bottle, and tied down 
as before, but it fuccecded not lb well as at firll, tho' the cork 
was now prcffed down into the neck, and became level with the 
mouth of the bottle. 
Dr. Oliver went about a mile into the country to fee a well 
^-nuch talked of in thele parts, called Lay-irell '^ it is about fix 
f?)ct long, five broad and npar fix inches deep; it ebbs and flows - 
ievcra} 
