286 PHILOSOPHICAL TRANSACTIONS. [aNNO 1728. 



the level of the sea, according to Mariotte, 205-|- toises, or 1234 feet; accord- 

 ing to Dr. Scheuchzer, 21 0|^, or 1264 feet; and according to Cassini, 221^, 

 or 1330 feet. This town is distant from the mouth of the Rhine, which is 

 the nearest part of the ocean, at least 375 English miles, or 100 marine French 

 leagues; and from Genoa, which is nearest on the Mediterranean, 225 English 

 miles, or 02 French marine leagues. So that going down from Zuric north- 

 ward towards the sea, the descent, or fall, is but little more than 12 feet for a 

 marine league of France, if we suppose a straight line to be drawn from Zuric 

 to the sea-shore in Holland ; but it is much greater going southward towards 

 the Mediterranean, where it comes at least to 20 feet for 1 league. And if we 

 consider, that the highest mountains of Switzerland lie almost directly between 

 Zuric and the Mediterranean shores, we must allow so much more in propor- 

 tion, as those mountains are elevated above the horizon of Zuric ; and how 

 great and sudden this elevation is. will appear by the following observations. 



At Ennen Sevven gen Aweren, in the ascent of the high mountain Freyberg, 

 in the canton of Glarus, which lies south east of Zuric, the mercury was ob- 

 served Sept. 11, 1710, at 23-1- inches; which gives the height of that place 

 above the level of the sea, according to 



Mariotte 5691- toises, or 34l6 feet. 



Dr. Scheuchzer 584^ 3508 .... 



Cassini 712-i^ 4275 



Upon Scherf, one of the branches of the Freyberg, the Mercury fell Sept, I 2, 

 1710, to 2] -J inches ; which gives the height of that part of the mountain, 

 according to 



Mariotte QOQ± toises, or 5437 feet. 



Dr. Scheuchzer 93 H 5588 .... 



Cassini 1247f 7486.... 



Still higher on Blattenstock, another part of the same mountain, the Men- 

 cury fell on the same day to 21^ inches, which answer, according to 



Mariotte 933^ toises, or 560O feet. 



Dr. Scheuchzer 959i 5756 ... . 



Cassini 1293^ 776 1 .... 



Hence from Zuric to the Blattenstock, near the top of the Freyberg, there 

 is, in less than 3 days journey, a rise of 4366 feet, according to Mariotte, 

 and 4492, according to Dr. Scheuchzer, that is, more than 3 times the eleva- 

 tion of Zuric above the level of the sea. 



At Guppen ob Schwanden, in the same canton of Glarus, the Mercury was 

 observed, August 5, 1705, at 23^- inches, which give, according to 



Mariotte 644i toises, or 3865 feet. 



Dr. Scheuchzer 66 1 j 397 1 .... 



