C ) 
BoJies^'^atid frdft'mG^^ Countries freezing Men irr 
Mofeovy, and even in Flanders^ fo that they come as if 
alive on Horfeback, without appearing dead to the Spe- 
dators. He thinks Plagues may likewife have their 
rife from one or other of thefe Steanis, and according to 
their condenfing or rarifying effefts, are to be treated 
by cordial or heating, and cooling or coagulating re- 
medies* 
/'V As he thinks fome Damps to be hurtful from the ve» 
ftemous Vapours, fo he concludes others to kill by the 
Airs being too full of vaporous Matter/which in it 
(elf may be harmlefs, but may hinder the mixing of 
fufBcient Air with the Blood, whereby the rarefaSion 
and fermentation of the Blood may be hindred ; this he 
thinks to proceed rather from Steams mixed with the 
Air in Gaverns, than for want of motion in^ fuch^ places; 
the-want of which he thinks cannot make any alterati- 
on in the Air of Caverns, it being ftill Air, and having 
the motion of a fluids tho' notof tranflation. He thinks 
; ftagnant Water to corrupt by the mixture of heteroge- 
•rieous Bodies froni the Earth and Air, rather than the 
J#ant -of Motion of Tranflation ; he is of opinion^ 
%at fdhie' Cdverns are free from fuch Damps by a Wind 
kroming naturally out of them, wliich he obferved fo 
I 'great in the large Salt Mines in Poland, to raife Tern* 
I pefts in them under ground. 
He is of opinion that feme deadly Damps proceed 
I '*alfo from the too great abundance of ySther attenua- 
1 ting too much the Air^ which he believes to be neither 
hurtful from pernicious fleams , they not affeaing 
Candles as thofe do ; nor Ihew too great quanti' f of Va- 
lorous Matter - here he gives a long account; of the 
'^^opoiitak Grotto del Cane, and the Experiments mede 
f| liiere By him who has care of it, t'/^:. that by holding a 
Dog by the Legs, and keeping his Head to the roftcm 
of the Cavern, in a little while he grows convulfive, 
and 
