[ 26] — 140- 
THE-BAROMETRICAL PROFILE. 
“ If the elevation above the sea-affords in other countries so probable a 
by myself on the road, and cotemporaneous observations made by Dr. G 
Engelmann in St. Louis, and by Mr. Lilly in New Orleans. 
My barometer was a syphon barometer of 30 English inches. After 
having been filled with purified mercury, and boiled out several times, I 
‘compared it before my departure with Dr. Engelmann’s, and found mine 
to be U''.139 higher than the latter: After my return to St. Louis, another 
comparison proved. it to be only 0.123 bigher: it had during the whole 
time changed but 0”.016—a most favorable result, if the long transportation 
of it by. water and land, in. carriages and on pack-mules, often over the. 
roughest road, is considered. . ; 
the geometrical. measurements in the city are at. present reduced. It is 
Pp to be 38 feet 1 inch above the lowest water-mark of the river, _. 
and 7 feet 7 inches below-the highest water-mark in 184 
* 
