I 770 J 
cavitres of the airvejjel, lufFering more preffure than* 
they are patient of, from the coagulated and contigu- 
ous aqueous parts then congealed, may be induced to 
fuppofe thejb ftrepitpus eruptions^ to proceed from 
thence. Bnt whether Mr. HoW .r i;?)^<>^^^> will certain- 
ly hold, that the Iwelling is caufedby the intrufioa of the 
Air, is (omewhat to be doubted. 
- It need not prove troublefome to any to think the air 
ta^ be able to tear th^ Oake^ or other Trees, whoftiall 
confider the great force and elaftick power thereof » 
whereof that moft excellent and Curious Philolopher of 
our age Ejq-y Boyle hath in his Hiftory of Cold fet forth 
feveral Experiments and Examples, as VefTels of fevcral 
kinds of Mettals ^ being made ftrong on purpofe and 
fiirdwith water clofe flopped andexpofed to the Cold^ 
which being not capable of withftandingthe expanfive 
force of the inclofed Ice, have been found cleft and bro- 
ken 5 asforinftance a ftrong S^rr^/of a Gun clofe flop- 
ped, with water in it, o^n^fro^en, hath provd rent long- 
waies, and never a crofs the VeffeU not bodies of the trees 
we here mention : Another time a brafs-veffel of a Cylin- 
driacaliormhQixig made not more then y inches deep and 
not 2 diameter fill'd with Water and afterwards frozen, 
in one night lifted off the cover prepared and clofely 
fitted, with a weight of j6 pounds that was laid upon it. 
Olearius^ Secretary to th-e Duke oi Holfieins Embafly into 
B.uj[ta, tells us that in the City of Mojco he obferved ( the 
€Qld being very intenfe ) the Earth to be cleft many yards 
in length and afoot broad, which according to conje- 
cture was occafi'oned by the heaving and fwelkng there- 
of to enlarge its roome, as here we fee Ice crackt and 
cleft cionfiderably long and broad according to its 
thicknefs along the ridge or turgid part thereof And 
that the ^^r^^ doth fo rife when frozen is eafily made 
manifeft by little jiicks or plants fet into the ground a- 
gainfl the: approaching Winter, which being rifen 2 or 3 
inches 
