It would probably be correct to say that this plant is found in every State in the Union, and that it succeeds well in nearly all the Northern States, from sea to sea. Although it grows well in certain parts of the Southern States, especially in those that lie northward, the general adaptation in these is not so high as in those further north. The highest adaptation in the United States is probably found in the Puget Sound region and in the hardwood timber producing areas of the States which lie south from the Great Lakes and in proximity to them, as Northeastern Minnesota, Northern Wisconsin, Michigan, Ohio and New York. But the adaptation is also high in the more elevated of the mountain valleys of the Northwestern States when irrigated 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 likewise low in their adaptation, but not so low as the former. The prairie areas of the Northern Mississippi basin have an adaptation for growing white clover that may be termed intermediate, but where hardwood forests grow naturally on these the adaptation is high. In New England the climatic conditions are very favorable, much more so than the soil conditions. In Canada, conditions are found highly favorable 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 conditions are against it, because of their rocky character. Certain forest areas west from Lake Superior, and also in other parts, the sandy soils of which sustain a growth of Jack Pine (_Pinus murrayana_) trees, do not grow white clover with much vigor. The prairie areas of Canada, westward from Lake Superior to the mountains, do not grow white clover with much success, and the adaptation for its growth would seem to lessen gradually until the Rocky Mountains are approached.