A correspondent of the Germantown Telegraph writes: "On dry or wet ground the effect of the roller is found to be salutary. Plowed and prepared for sowing, dry land is much helped by the roller. The blades of grass spring up sooner and retain a firmer hold in the earth. In wet and heavy ground it is believed the roller, smoothing and hardening the surface, will leave the soil immediately beneath the surface in a better condition to generate the seed. On grass ground that has been heaved by the frost, the roller has an excellent effect in fixing the roots. Rolling the ground is also good when the land has been laid down unevenly the previous year. If the land is too dry, wait till just after a soaking rain, and it will work capitally. It is a good idea to roll plowed sowed ground before harrowing, as it presses down the furrows that would be turned back, and makes the surface less uneven, and the harrow pulverizes it much. We find that on an average not one farmer in four has a roller."