(boulders, but one only Body , and that well form’d , yet having 
double entralsinall refpefts, The Ewe remains well. TheMotr 
fter dyed, and is nowin my Cuftody, after it hath been dried in 
an Oven, and by the Sun. 
Some Observations made in Mines, and at Sea* occafioning a 
Conjecture about the Origine of Wind : Imparted by the 
fame Mr, C* 
' One John Gill, a Man well experienced in Mineral affairs, diP 
courfing with me about the Wind and its Origine:, declared tome 
his thoughts concerning the fame, as arefultoftwenty years Expe- 
rience and Obfervations of his own. 
Fir/l, He affirmed , that if in digging deep under ground, the 
Work-men meet with Water, they never want Air or Wind } but 
if they mifle Water (as fometimes it happens, even at 12 or i 6 Fa- 
thbmsaeptfy they aredeftitute of convenient Air, either to breath 
in, or to make their Candles burn. 
’ Next , When (asufual) there happens to be a great quantity ofa 
Winters handing water , in a deep Mine, they commonly bring, 
or drive up an Adit for drawing away fuch water : But as foon as 
that part of the Level is made, that any of the handing Water be- 
gins to run away, the Men muff fecure themfelves 5 as well as they 
can, from danger of being dafo’d in pieces againft .the fides of the 
Adit : For the included Air or Wind in the handing Wafer, breaks 
forth with fuch a terrible noyfe, as that of a Peece of Ordnance, 
and with that violence, as to carry all before it, ioofening the ve- 
ry Rocks, though at fome dihance in the Work or Adit. 
Thirdly > he hath obforved onfeveral occafions a going to and fro, 
between London and Plimouth , by Sea, that being in a Calm, that 
way, which the Sea began to Loom or move, the next day the 
Wind was fure to blow from that point of the Compals , towards 
which the Sea did Loom the day before. 
An Account of Hail-Stones of an unufual bignefs 7 Communi- 
cated by D. Nath. Fairfax, with his Reflexions on them # 
This Account cam but very lately to hand) though the thing hapned 
a while agoe j the Ingenious Author thereof, \ having but newly enired 
into a Philofophical Correjpondcnce with the Publither. 
%/v, 17. 1 666. About 10 in the Fore-noon, there fell a violent 
■ Bbb ftorm 
