( 6 7 3 ) 
In Hyclroflatkks, That a hollow Cone ((landing up- 
on its Bafis) being fill'd with Water, the Water ftiall 
prefs the bottom with three times the Weight, as if the 
lame Water was frozen to Ice ; and Figures might be 
contrived to make it prefs a hundred times as much. 
Theft Speculations, as they are generally pleafant, fo 
they may alfo be of good ufe to warn us of the Mi- 
flakes we are liable to, by carelefs and fuperficial reafon- 
ing. 
1 lhall add one Inftance in Arithmetic/:, which per- 
haps may (eem as great a Paradox as any of the for- 
mer. 
There are two Lotteries, at either of which a Game- 
fter paying a Shilling for a Lot or Throw the Firft 
Lottery upon a juft Computation of the Odds has 3 to 
1 of the Gamefter, the Second Lottery but z to 1 ; ne- 
ver theleft the Gamefter has the very fame difad vantage 
(and no more) in playing at the Firft Lottery as the 
Second. 
It looks very like a Contradiction, that the Difadvan- 
tage fliould be no greater in playing againft 3 to 1 than 
z to i, but it may thus berefolv'd. 
In the firft Lottery the Gamefter hazards a Shilling to 
win a Groat, and the Chances being equal, it is evident 
there is 3 to one againft him. 
In the Second Lottery the Gamefter ventures a Shil- 
ling againft a Shilling, and the Lots being 4 to 2, his 
DHad vantage is z to u 
And a Lot at either of them being truly worth juft 
8 Pence, (viz. the 6th part of 3 times 1 6 Pence, or 
twice z Shillings) the Difad vantage muft be the very 
fame 
