( t <54) 
lie did not pretend to exa£tnefs,but only to excite the .careful- 
nefi of others in the feveral diftaut places, and chiefly Inch, as 
can have the affiftance of a Wbeelballance perfectly filled : with- 
out both which aids he hopes not to'obtain all the benefits and 
nlyfterks of this Invention. 
This being thus briefly intimated , the Account of the Ofe» 
fervations themfelves, as they were extracted out of a late Let- 
ter of the fame Perfou, are, as followes : 
1. As I have fitted and filled the Single Cane, I can fay in the 
general. That I have not yet found a iy luch infallible Progno- 
itick of thefe changes of weather, which do follow a long fere- 
nity,or fetled weather. And perchance in brighter Climats it 
may be conftantly infallible. In thefe Northern 1 floods, the 
Clouds are fo fliort, and narrow, and by fickle changes are 
fometimes emptied upon us/omeiimesfo neer,as may make fo 
little variation in the weight of the whole Atmofphere of Air, 
as may fometimes deceive us, or (mother and hide from us the 
caufes of fixednefs,or of changes. I wiffi I could fee a good Ca- 
lender or Journal taken in Tangier , and in fome of our Northern 
and mo ft Southern parts of America. I have ftore of Hygrofcofes 
nothing fo neerly indicative of the change of weather , as this 
Ballance . Thofe others are often changed by Dews, which do 
not at all alter the Ballance „ nor alter the ftate of the weather : 
And the open Weather-glafs is known to fignifie nothing at 
certainty 3 having a double obedience to two Mailers, fometimes 
to the Weight of the Air ^ fometimes to Heaths the fervice is com- 
manded. 
2. And in further confirmation of this Note, I may adde to 
the former,That in Jamary I aft i 6 <$f,from the fourth, and more 
cfpccialfy from the feventh day, for many daies it continued ve= 
ry dark 3 fo that all men expedled daily great rain ; yet the Mer- 
cury held very high,neer to the greateft height ; And though in 
thofe daies fometimes thick mills arofe and fome fmall rain fell, 
yet the Quicffdver held at, a great height : which did indicate to 
me, there codld then be no great change of weather. As the fmall 
rain fell, it yeilded fomewhat, not much $ and that does more 
Hygrofcopes are Iuftruments, 
to difcover the degrees of Moi- 
jfure and Drought of the Air. 
of divers kinds , and I do remark 
them, and the fweatings of Marble, 
and as many other famed Progno- 
fticks,as I can hear ofh>but can find 
coo- 
