166 



Food for Plants. 



loiigtli, l)r('adUi and lici.ulil of the crib, inside of the rail; 

 multiply the length by the breadth and the product by 

 the iieight; then divide the product by two, and you have 

 the number of bushels of shelled corn in the crib. 



To iind the number of bushels of apples, potatoes, etc., 

 ill a lull, multiply the length, breadth and thickness 

 together, and this product by 8, and point off one figure 

 in the product for decimals. 



To find the amount of hay in a mow, allow 512 cubic 

 feet for a ton, and it will come out very generally 

 correct. 



Length of Navigation of the Mississippi River. 



The length of navigation of the Mississippi liiver it- 

 self for ordinary large steamboats is about 2,161 miles, 

 but small steamers can ascend about 650 miles further. 

 The following are its principal navigable tributaries, 

 with the miles open to navigation : 



Miles 



Minnesota 295 



Chippewa ^^ 



Iowa 8^ 



Missouri 2,900 



Bis Horn 50 



Allegheny 325 



Muskingum 94 



Kentucky ^^'^ 



Wabash 365 



Tennessee |-'0 



Osage 30L 



White 779 



Little White 48 



Big Hatchie ''^ 



Sunflower 271 



Tallahatchie I'^S 



Red 986 



Cv])ress 44 



lilack <il 



Bartholomew 100 



Macon ^'0 



Atchafalaya 218 



Lafourche 168 



Miles 



160 



64 



:?50 



474 



950 



110 



94 



200 



600 



50 



180 



147 



884 



Issaquena 161 



Wisconsin . . 



Rock 



Illinois 



Yellowstone . 



Ohio 



Monongahela 

 Kanawha . . . 



Green 



Cumberland , 



Clinch 



St. Francis .. 



Black 



Arkansas . . . 



Yazoo . . . . 

 Big Black . 



Cane 



Ouachita .. 

 Boeut' . . . . 

 Tensas . . . . 



Teche 



D'Arbonne 



228 

 35 

 54 



384 

 55 



112 

 91 

 50 



The other ten navigable tributaries have less than fifty 

 miles each of navigation. The total miles of navigation 



