410 M. de luc’s Barometrical Obfervations on 
French toifet* 
The depth of the Dorothy pit between two' 
fixed points, 
That of the Caroline, relatively to the fame] 
point at the mouth, 
That of the lowed; fearching gallery of the'l 
Benedict, relatively to the fame point, 
168,96 
170,74 
I43>96 
Mr. Friedrich was appointed to give me the geome- 
trical meafures. He had been prefent at my obferva- 
tions, and found the refults of them fo near thofe mea- 
fures, confidering they had been furnifhed by a method 
fo eafy, and according to his notions fo extraordinary, 
that he gave me a certificate in due form of the real 
heights, which are as follows : 
The 
Toifes de Fn 
La profondeur du puits de la Dorothee, entre deux points fixes, 168,96 
Celle du puits de la Caroline, relativement au raeme point d’enhaut, 170,74 
Celle de la galerie de recherche la plus profonde de la Benedi&e, de meme, 143,96 
Ge fut M. Friedrich, qui fut charge de me communiquer Ies mefures geo- 
metriques. II avoit ete temoin des obfervations; et il en trouva les refultats ft 
pres de ces mefures, pour avoir ete founds par une route ft aifee et ft ftnguliere 
a fes yeux, qa’il m’expedia un certiftcat en dues formes de ces hauteurs reelles :: 
•lies etoient comme fuiti 
U 
