( 212 ) 
third, the Heights or Depths anfwering to thofe Lines 
of Mercury , which, in the Memoirs, are given in Toifes, 
but here reduced to Feet ; the fourth, the Number of 
Feet anfwering to one Line of Mercury in each Obfer- 
vation, which is the Quotient of the Feet in the third 
Column, divided by the Number of Lines in the Second. 
Obfervations of the Ba 
meter made at 
I. Collioure - 
II. The Tower of MafTane, 
III. Bugarac 
IV. Rupeyroux - 
V. Rodez 
VI. Rodez 
VII. Courlande 
VUI.Cofte 
IX. Clermont 
Lines of 
Mercury. 
Said to corre- 
fpond with 
Feet. 
° 3 f 
*95 
31 
2382 
4 i 
3636 
30 
2181 
24 
1647 
20 
1425 
5 + 
48 12 
54 
4890 
03 
200 
The Tall of one Line 
of Mercury an- 
fwers to Feet. 
76,8 
86 ,? 
7 2 ,7 
68 , 6 - 
9 2 , 4 
66,6 
A Sight of this Table will convince any one, that 
thefe Obfervations are not to be depended upon for de- 
termining the Height of the Mountains in the South of 
France j for the Differences are not final!, fuch as 
might happen in making the Experiments j but fuch as 
render the Obfervations ufelefs for the Purpofes above- 
mention’d. For Example, the firft and the feventh 
differ almofl f : And if 58 5 Feet were allow’d for the 
Fall of one Line of Mercury in the feventh Obfervatiorr, 
inftead of 944 Feet, then the Mountain of Cofie would 
be but 3.085 Feet, inftead of 489©. Nay, upon exa- 
mining the Memoirs, I find that in feveral Obfervations 
the Number of Toifes, faid to correfpond to a certain 
Height of Mercury , are only anfwerable to the Height 
of the Mountain above the Level of the Sea found by 
Trigonometry, from which the Height of the Royal 
Obfervatory , above the Sea, is fubff rafted ; though, by 
the Manner of the Expreflion, a curfory Reader would 
imagine 
