in much of New
York, Ohio, Indiana, Illinois, Iowa, Missouri, Kansas and Nebraska. In
the Southern States that lie northward, good crops may be grown in some
locations, but not in all. As the semi-arid belt is approached, mammoth
clover will grow further west than the medium red, but in the greater
portion of this region it will not succeed. The adaptation of the North
Atlantic States, including those of New England, is not of a high order,
but rather more so, probably, than for the medium red.

In Canada also the adaptation of medium and mammoth clover is much the
same as for the medium red. In some parts of Ontario, especially Western
Ontario, it grows remarkably well; but in the maritime provinces it does
not grow so well; nor does it thrive in the provinces of the Canadian
Northwest as it does in Ontario.

As with medium red clover, the distribution of this variety has not been
fully determined in either the United States or Canada, more especially
on soils of the prairie, where it does not succeed well at present. It
is probable that under some conditions on these soils, and also in the
South, the absence of the requisite bacteria in the soil may account, in
part, at least, for failure in attempts made to grow it. With the
introduction of these, the area of successful cultivation may be
considerably extended.

=Soils.=--Mammoth clover may usually be successfully grown in soils well
adapted to the growth of the medium red variety. (See page 65.) This
means that it will usually grow with much luxuriance in all areas which
produce hardwood timber, and are usually covered with a clay or muddy
loam soil underlaid with clay. It will also grow with great luxuriance
in the volcanic ash soils of the irrigated valley lands of the Rocky
Mountain States, and in the loam and light loam soils of the Puget
Sound country. It has greater power than the common red variety to grow
in stiff clays, in sandy soils underlaid with clay, and in areas where
moisture is insufficient near the surface soil. In stiff clays the roots
penetrate to a greater distance than those of the medium red variety and
gather more food. Consequently, a stiff clay soil that would only
furnish a light crop of the medium red variety in a dry season may
furnish an excellent crop of the mammoth. The quality of the hay is
likely to be superior to that grown on soils altogether congenial, since
it is not likely to be over-rank or coarse.

On sandy soils underlai