422 



TRANS. OF THE ACAD. OF SCIENCE. 



Mean Stage of the Mississippi River at St. Louis above the Low 

 water mark of December, 1803, in every month from May, 1843, 

 to April, 1845, and from January, 1861, to December, 1865. 



Highest and Lowest Stage of the Mississippi River at St. Louis 

 above the Low water mark of December, 1863, in every month 

 from May, 1843, to April, 1845, and from January, 1861, to 

 December, 1865. 



TEAR. 



1843... 

 1844... 

 1845. . . 

 1861... 

 1862.. 



JANU Y. 



min. max. 



3.5 6.7 

 7.7 11.7 

 1.6| 3.6 

 3.5 11.9 



1863 9.4 15.2 



1864 1.21 7.0 



1865 1.5 3.2 



febr'y. 



mm. max. 



MARCH. I 



min. max. 



10.5 20.0 

 13.315.3 

 14.718.2 



6.618.5 

 11.818.0 



6.211.1 

 10.0 23.4 



mm. max. 



15.7 26.5 

 12.7,19.3 

 16.6 22.0 



7 years. .. 1.215.2 1.1 16.6 1 6.2 23.4 ' 8.1 31. 4 1 9.1 33.0 8.8 41.4 



18.0 



12.0 



8.1 



16.7 



31.4 

 16.4 

 19.4 

 25.1 



mm. max. 



mi>?. max. 



20.4 27.3 20.5 25.1 



24.5 33.0 30.141.4 



17.6 25.5 



21.0 30.1 



9.1 14.4 



9.7 20.4 



12.2 20.0 



16.5 20.0 

 18.4 20.9 



8.8 14.8 



8.9 11.8 

 11.3 18.7 



JULY. 



min.vmax. 



14.921.0 



25.1 39.3 



12.6 23.9 



16.4 20.6 



6.611.9 



7.612.5 



18(55 16.0 26.8 



7yrs 6.639.3 



1843 

 1844 

 1861 

 1862 

 1863 

 1864 



min. max. 



2.314.3 



minjnax. 



4.3 6.8 

 7.9 9.1 

 6.4l 8.3 

 7.610.1 

 4.0 5.3 

 2.3; 6.8 

 ;8.213.5 



2.313.5 



The mean results of these seven years' observations show 

 the average height of the Mississippi at St. Louis to be twelve 

 feet; in the six months from September to February it ran- 

 ges below, and in the five months from March to July above 



