[I23S3 
TranfaBions^ that the Mercury is not affected with the rve^» 
ther, or very rarely^ let it be Cloudy ^ ^^^y^ Windy, or Se- 
rene in St Helena, or the Barbadoes, and therefore pro^ 
bably not within the Troptcks^ unlejsin a Violent Jiorm or 
Hurricane. Now if the Mercury move little or no- 
thing m the Barofcope, tis likely there is little or no 
Change in the Gravity of the Atmofphere within the 
Tropicks. 
Tour moft Humhle Servant^ 
WILLIAM MOLYNEUX, 
Part of a Letter from Vr. Nath. Vincent. F. oftbe 
R. S. concerning Dr Papin's waj/ of Raifing 
Water. 
I Have inquired into D' Papins Problematic En- 
gine for raifing Water, in the Tran/aSion of July 
id8f, and do conclude it may be folved after this 
manner. Within his Rock C C (fee Phil. Tranf, Num. 
173, Fig. 1 8th J there may be a Veffel placed, which 
ftiall be made like the Body of a pair of Bellows, or 
thole Puffs heretofore uled by Barbers, which being fil- 
led with water, a piece of Clock-work put under it may 
produce the Jetto s ; the water being received into the 
Shell HH, and running thence into the hollow of the 
Goral E E ; may be thereby conveyed into the follicu- 
lar cavity, in the lame quantity it is ejedted from the two 
Emerging 
