284 PHILOSOPHICAL. TKANSACTIONS. [aNNO 1728. 



found to be of 1240 yards, or 3720 English feet, which makes 3488 Paris 

 feet. At the top of this mountain, the Mercury subsided to 23^ inches, or 

 24 inches Paris measure. Now in the tables above, the height of the place 

 where the Mercury subsides to 24 inches, is, according to Mariotte, 544^ 

 toiscs, or 3266 feet above the level of the sea ; according to Cassini, 676 toises, 

 or 4056 feet, and according to Dr. John Scheuchzer's calculation SSQi toises, 

 or 3356 feet ; so that Mariotte comes 222 feet short of its height, as it was 

 determined trigonometrically, Dr. Scheuchzer but 132, but Cassini exceeds 

 this height by 568 feet, which confirms again, as in the former paper, that the 

 Mariottian table is preferable to that of Cassini, though pretended to have been 

 corrected on the former, and that of Dr. Scheuchzer is an improvement on 

 both. According to the observation made by Dr. Halley, May 26, 1697, the 

 Mercury stood at the top of Snowden-hill, at 26-V inches English, which, re- 

 duced as above, would give the height of the mountain something less. 



In France, when the meridian line, first begun in 1669, was continued in 

 1703, the heights of several mountains, particularly in the south of France, 

 were determined trigonometrically by the members of the Royal Academy of 

 Sciences : and we find in their Memoirs, the heights of the following : 



Height in 

 Toises. Feet. 



Mont Clairet in Provence 277 or 1662 



La Massane in Roussilion 397 2382 



The same according to another observation 408 .... 2448 



Bugarach, a mountain Languedoc 648 .... 3888 



Motmtains in Auvergne. 



Le Puy de Domme, near Clermont 810 ... . 486o 



La Courlande 838 5028 



La Coste 851 5106 



Le Puy de Violent 833 5118 



Le Cantal 984 5g04 



Le Mont d'or 1030 . . . . 6I8O 



In the County of Avignon. 

 Le Mont ventoux 1036 .... 6216 



Pyrenean Mountains. 



S. Barthelemy dans le paix de foix 1 185 .... 71 10 



La Montagne du Mousset 1 258 7548 



Le Canigou 1440 §640 



