596 Geological Journey to Mount Ramazzo 



junction look place 6"^ SS^-S sooner, or at 21^ 9"^ 26*'S ap- 

 parent tin>e^ when the Sun's true place from the mean 

 equinox by Mayer's tables was 7** 16^ 17' 13"*3, or 7" 16^ 

 17' 8"*5 if we take into account the correction to be made in 

 the tables which the Greenwich observations make — 5" 

 nearly. Hence the place of the node is found to be 1* 13^ 

 5S' 56"-3. 



LVIir. Geological Journey to Mount Ramazzo in the Jp- 

 pcnines of Ligurm ; Description of this Mountain; Dis- 

 covery of' the true VarioUte in its Bed ; of Lime ; of the 

 Arragonife ; and of Martial, Magnetic, Cupreous, and 

 Arsenical Pyrites, in the Steatitic Rock ; Manufacture of 

 the Sulphate of Magnesia, By M, Faujas St. Fond*. 



Xn 1780, Messrs. de Saussure and Pictet visited the moun- 

 tain Madona della Guardia, elevated 422 toises above the 

 level of the sea, and of which mount Ramazzo forms a 

 part. 2\fter having given an excellent lithological descrip- 

 tion of the first mountain, Saussure thus expresses himself f: 

 *' On ascending and descending the mountain della Guardia, 

 we had a view to the westward of a mountain, from which 

 we were separated by a very deep ravine, and from whicU 

 we were informed that martial vitriol had been extracted ; 

 but I had no knowledge of the substance in which it was 

 found. At the distance from which we saw this mountain, 

 it seemed mixed with slate and ferruginous earths." 



It was this mountain, (known by the name of Mount 

 Ramazzo,) thus neglected by Saussure, which principally 

 occupied my attention for two reasons : in the first place, 

 because I had been told that trenches were dug at the sum- 

 mit of this mountain, and that a manufacture of sulphate 

 of magnesia had been established there : secondly, because, 

 the steatitic and serpentine rocks of this mountain being 

 united to lime in certain points, I was anxious to visit this 

 curiositv so seldom discovered. 



* "From Annates du Mushim d* HJstoire Naturelle, tome viil. p. 313. 

 t ^'"!i"S^ acy^'auisurt dans tes Jlpes, tome iv. p. 145. 



M. Max!- 



