150 A SURVEY oF THE 
the upper part of its course within the Himdlaya, flowing from the south 
of east to the north of wests and it is only from Suc’hi, where it pierces 
through the ney a that it assumes a course e of about south 20 west, 
THE fall of the Jumna, from Jumnotrt to the Dun, is very consider. 
able.—I recret I had not a good barometer, to-ascertain the height of 
Jumnotri; Thad with me an empty country made barometer tibe, with 
which I endeavoured to gain an approximate idea on the subject.—Hav- 
ing warmed and well dried the tube, I filled it gradually with mercury, 
driving out such air bubbles as were visible, and: inverted it in a deep 
cup of quicksilver, taking care not to remove my finger from the ori« 
fice, till the lower end of the tube was fairly below the surface of the 
quicksilver ;—the tube was kept in an erect position by means of a 
plumb line, 
Inch 
Tre length of the column was 20 40, which, corrected for tem- 
perature, gives 10,483 feet for the height of Jumnotri above the Seay 
taking 30 04 inches for the level of the sea. 
Tae above is only a rade experiment, but I had not the means of 
making a betters the length of the column may be depended on to the 
20th part of an inch, I think, but the probable impurity of the mercury 
may cause an error of 2 or perhaps 300 feet, 
Near 1 nocn, I look a short set of circumnemeridional altitudes of ey san 
for the latitude, as follows: 
