WHITE CLOVER 265 



timber producing areas of the States which he south 

 from the Great Lakes and in proximity to them, as 

 Northeastern Minnesota, Northern Wisconsin, 

 Michigan, Ohio and New York. But the adapta- 

 tion is also high in the more elevated of the moun- 

 tain valleys of the Northwestern States when irri- 

 gated waters may be led on to these lands. The 

 areas lowest in adaptation are those that lie within 

 the semi-arid belt. The low-lying lands of the South, 

 where hot weather is prolonged in summer, are like- 

 wise low in their adaptation, but not so low as the 

 former. The prairie areas of the Northern Missis- 

 sippi basin have an adaptation for growing white 

 clover that may be termed intermediate, but where 

 hardwood forests grow naturally on these the adap- 

 tation is high. In New England the climatic con- 

 ditions are very favorable, much more so than the 

 soil conditions. 



In Canada, conditions are found highly favor- 

 able to the growth of this plant in the country lying 

 eastward from Lake Huron, north of Lakes Erie and 

 Ontario and also on both sides of the St. Lawrence 

 River. Adaptation is also high along the Pacific 

 and in the mountain valleys not distant from the 

 Pacific. In all the areas of Canada, which once 

 produced forests, this plant will grow well. But 

 north from Lakes Huron and Superior, the soil con- 

 ditions are against it, because of their rocky char- 

 acter. Certain forest areas west from Lake Supe- 

 rior, and also in other parts, the sandy soils of which 

 sustain a growth of Jack Pine (Piiiiis murrayana) 

 trees, do not grow white clover with much vigor. 



