SUMMARY OF ALFALFA SOWING. 521 
variety, and that it will not be necessary to have 
so thick a stand where it is planted. This point has 
not been fully demonstrated as yet, although the 
indications are that the Grimm does yield heavier 
than the common alfalfa. 
Siberian Varieties —The Siberian varieties intro- 
duced by Prof. Hansen have been experimented with 
for several years in the Dakotas and Minnesota, and 
reliable data are just beginning to be gathered con- 
cerning their value and adaptability to our agricul- 
ture. The present indications are that in hardiness 
and possibly some other characteristics they are as 
superior to the Grimm as that variety is superior 
to the common alfalfa. As yet the seed is so scarce 
and high-priced that it is out of the question to grow 
them on a large scale, but in a few years there will 
be more seed and they can be grown more commonly, 
if their merits justify their substitution for the com- 
mon alfalfa in regions where the winters are severe 
and possibly in regions of only moderately cold win- 
ters. In our tests in Ohio carried on in a small way 
it seemed that the first year that the plants were set 
out they would outyield the Grimm to about the ex- 
tent that the Grimm outyields the common alfalfa. 
No definite conclusions have been reached as to this 
point as yet, however. 
Cossack.—This variety, imported by Hansen, 
seems at present to be of more value than the other 
Siberian varieties. It is, like the Grimm, a hybrid, 
being a cross between a yellow-flowering and a 
