( T 47 ) 
5 Feet, or XI Darts Miles (at 2000 Toifes the Mile) 
23 2 Toifes, 5 Foot. But as in order to determine the 
whole Height of the Atmofphere, the Logarithm of i"' 
ought to be deduced from the Logarithm of 3 3 o r 
28" o % and as that Logarithm is ooooo, it follows 
from thence, that beyond the Place, where the Mer- 
cury would defcend to i ,/; , the Air is expanded into an 
Indefinite Space. 
For the Satisfaction of the Curious, I have added 
the Tables themfelves, to wit, thofe which CaJJini the 
Younger calculated according to the Rules of Marl - 
otte , thofe which he deduced from the Obfervations 
made by the Gentlemen of the Royal Academy of 
Sciences, who drew the Meridian Line, and thofe 
which my Uncle calculated from the Obfervation made 
at P Jeffers in 1709. 
In another Paper on this SubjeCt I intend to com- 
pare the Height of Mountains, as determined by divers 
antient and modern Writers, with the true Pleight of 
them, as it appears to be by the Barometrical Obfervati- 
ons, particularly thofe made by my Father on the high 
Mountains of Swijferland. 
II. ObferVations of a Difference of Sex in Mifleto, 
in a Letter from the Reverend Mr. Edmund 
Barrel to Sir Hans Sloane, Dart. See. 
SIR, 
A FTER I had mentioned my being pretty well 
allured, that the Plants of Mifleto were fome of 
them Male, and fome Female 3 and had promifed to 
Dddd 2 com- 
