666 TRANS. OF THE ACAD. OF SCIENCE. 
Bro’t Echiad i 9 Eng. ft, 
Low water below City Directrix - 0.5 
Low water above Gulf - - - - Sg ew 
This gives the elevation of St. Louis a few feet lower than 
either of my prede ecessors has found it. The following 
shows the different results 
Nicollet. Wislizenus. Engelmann. 
Engelmann’s barometrical station 
above Gulf, : 486.5 496.0 480.9 ft. 
City Directrix do. ait’ 410.5 420.0 404.9 “ 
Low water mark do. do. 380.0 3889.5 374.4 “ 
Intimately connected with the altitude of St. Louis and oth- 
er points along our river is the question of the fall of the river 
and the velocity of its current. Nicollet’s tables, mentioned 
above, give us the only data at — available for an ap- 
proximative estimation of the fall of the Mississippi in its dif 
ferent sections. The following little table, calculated from 
these data, explains itself: 
& 
DISTANCE FALL Es 
IN MILES. IN FEET. ad 
zs | ge || B | ge || $8 
ae net ~ i 7. 
28 Es 28 &2 Se 
em 4 ga | ge ng 
es | $2 || £3 | Be ll & 
fx Ba fe Ba 
Mouth of St. Peter’s River to 
Prairie du Chien, é 60 | 260 |} 102 | 102 | 0.89 
Rock Island, - “ 210 | 4 114 | 216 || 0.54 
Mouth : Desmoines, - || 128 | 598 |} 84 | 800 || 0.65 
St. Louis, - - 204 | 802 62 | 362 || 0.30 
Mouth of Ohio, - 74 | 976 58 | 420 || 0.83 
Mouth of White River, -. || 462 [1438 || 122 | 542 || 0.26 
Natchez, - - - || 848 |1786 || 116 | 658 || 0.33 
New Grlcani - || 302 [2088 || 76 | 734 || 0.26 
oa = F Mississippi, 104 2192 || 10 | 744 || 0.09 
Or in ate natural sec- 
tions = its co 
Mouth of St. Patera sa to 
Prairie du Chien, - 260 | 260 || 102 | 102 | 0.39 
Mouth of Desmoines, - || 338 | 598 || 198 | 800 || 0.59 
New Orleans, - - |/1490 [2088 || 434 | 734 || 0.29 
Mouths of Mississippi, 104 |2192 |) 10 | 744 |) 0.09 
Total un earege fall of the Mis- 
ippi from mouth of St. \| 9.94 
Peters River to the Gulf, | 0.84 
