SUCCESSION IN FORAGE CROPS. 253 



looked upon as the great reliance for pasture, 

 wherever such forage grows freely, whether spon- 

 taneously or otherwise. Other forage crops should 

 be made auxiliary to it, unless the growth of grasses 

 is so meager as to forbid giving these so prominent 

 a place. Wherever practicable a reserve of grass 

 forage should be held, as it were, for seasons of wet 

 weather and for those periods of emergency when 

 other forage crops may not be on hand or may not 

 be ready for being grazed. 



Grouping States and Provinces. — For the prac- 

 tical illustration of this question, the United States 

 and Canada may be divided into eight sections. 

 Beginning at the northeast, Section No. i will 

 include all the arable country east of Lakes Superior 

 and Michigan and north of the Ohio river. Section 

 No. 2 includes the states west of Michigan and Ohio, 

 north of the Missouri and Ohio rivers, taking in 

 Manitoba, and east of the Dakotas and Assiniboia,. 

 Section No. 3 includes the states south of the Ohio 

 and east of the Mississippi, and also the states of 

 Louisiana, Arkansas and Missouri, west of the Mis- 

 sissippi. Section No. 4 includes the states west of 

 Iowa, Missouri, Arkansas and Louisiana, south of 

 Dakota and east of the Rocky mountains. Section 

 No. 5 covers the states and provinces of Canada 

 west of Minnesota and Manitoba, north of Nebraska 

 and east of the Rocky mountains. Section No. 6 

 includes the Rocky mountain valleys north from 

 Salt Lake. Section No. 7 includes the Rocky moun- 

 tain valleys south of Salt Lake and extends west- 

 ward to the sea. And Section No. 8 includes the 

 narrow area north of California and between the 

 Cascades and the sea. 



