Dr. Engelmann on the Elevation of St. Louis. 395 
Mexico, printed by the U.S. Senate in 1848. They place the 
altitude of the present low water-mark at 389 feet 6 inches. 
Dr. Engelmann’s recent calculations and measurements give 
the height of the low water-mark at St. Louis at 874 feet 4 
inches, a few feet lower than either of his predecessors had esti- 
mated it. 
_ The following table shows their comparative results for three 
different points measure 
Height of St. Louis above the Gulf, in English feet. 
i Wislizenus, "4809 
4 
Nicollet. 
Engelmann’s Barometric Station, 486° 496-0 0-9 
i i 410°5 
estimation of the fall of the Mississippi in its different sections. 
‘The following little table, calculated from these data, explains 
itself : 
Oia ee oe eager 
Distances in Fall in feet. ge% 
miles. <& 
From | Total | From Total (S26 
point to |from St point tujfrom Bt. =a3 
point. | Peter’s. point. |Peter’s. go 2 
outh of S. Peter’s River to 
Prairie du Chien,....csccescseressseres? 260 260 102 | 102 | 0°39 
ie idlatid, Ui ie sees vee ste cect 910 | 470 | 114] 216) 064 
| Mouth of Desmoines, ....+.+++++-++* secs) 128 F698 84 | 300 | 065 
eee uOUls, i tn0.09-0,65)5 pels celnioe ae See 204 | 802 62 | 362 | 0:30 
Mouth of Ohio,........ecceecceeeers | 174 | 976 58 | 420 | 0°33 
Mouth of White River, . ....--+++ss++*" 462 | 1488 | 122| 542 | 0°26 
W063i. icsas condos eel eeareme ef 848 | 1786 | 116 | 658 | 0°33 
New Orleans,.... .. ss-er+ Genes $02 | 2088 i 484 | 0°25 
Mouths of Mississippi,..-.---- EE Chae 104 | 2192 10 | 744 | 0-09 
Or in the great natural sections . its course : 
Mouth of St. Peter’s River to 
Prairie du heen é ceviatnes PE Ree TF .| 260 | 260 | 102 102 | 0°39 
Mouth of Desmoines, ....--++++++ gaseaet 338 | 598 | 198 | 300 | 0°59 
New Orleans,.....+22+s++s Simeces wea ee| 1490 | 2088 | 484 734 | 0-29 
Mouths of Mississippi, ...-++-+-+++2°3°"" 04 | 2192 10 | 744 | 0°09) 
Total average fall of the Mississippi from| _ 4 
mouth of St, Peter's River to the Gulf... ___ 0-34! 
“The Mississippi River has therefore an average fall of about 
4 inches per sit - petween: St. Peter's and the Rapids, a little 
more ; from the lower end of the Rapids to New Orleans, a little 
less; in the region of the Rapids, about 7 inches; and from 
New Orleans to the mouth, about 1 inch pe mile. A further 
analysis of the tables shows the fall on oth rapids to be 21 
inches to the mile.” 
