It will probably be found true of it, as of other clovers, that it will thrive best on soils that have produced timber, and more especially timber of the hardwood varieties. This means, therefore, that it will grow well in probably all kinds of clay soils and also in loam soils underlaid with clay. It has high adaptation for soils abounding in lime. It can be made to succeed on hard clay subsoils from which the surface soil has been removed. But it will also grow well on sandy soils and even on gravels when a reasonable amount of moisture is present. The author succeeded in growing it in good form in 1897 and 1898 in a vacant lot in St. Paul, from which 6 to 8 feet of surface soil had been removed a short time previously. The subsoil was so sandy that it would almost have answered for building uses. This clover will probably grow with least success on soils of the prairie so light in texture as to lift with the winds, and in which the underlying clay is several feet from the surface, also in slough soils that are much saturated with water. Since it grows vigorously on road sides, in rocky waste places and even in brick yards when sown without a covering, the idea has gained currency that the harder the soil, the better the plants will grow, and the more surely will they be established in the soil; but this view does not seem to be in accord with the principles which usually govern plant growth. It will, however, send its roots down into hard subsoils so deeply that in certain seasons the plants could not be dug up without the aid of a pick. =Place in the Rotation.=--Since sweet clover seed is more commonly scattered in byplaces, or is self-sown from plants that have run wild, it can scarcely be said that it has ever been grown as a regular crop and in a regular rotation. Nor is it ever likely to become a factor in such a rotation unless its properties shall be so modified that it can be grown acceptably as a pasture plant. In such an event it would have the same place in the rotation as other clovers; that is, it would naturally follow a cultivated, that is, a cleaning crop, and precede some crop or a succession of crops that would profit from the nitrogen and humus which it had brought to the soil, and also from the influence which the roots would exercise mechanically upon the same. But the necessity for sowing it on clean ground would not be so great as with the other clovers, since it has greater power than these to overshadow weeds when the two grow together.