of the nature of compost the whole cultivated surface. Such land may, with a trifling expense, be kept very rich. Whilst this process is operating upon a part of the poor lands of a farm, the residue of them may lie fallow, or be fertilized by ploughing in such green crops as may be produced upon a lean soil.
The extraordinary means of enriching land are numerous. A little reflection upon the most common principles of philosophy will point them out. The elements, acting upon each other, are constantly producing effects, and the latter operate as causes in the production of effects more remote. Different soils, and different manures, and different crops must all be connected according to their respective and relative natures.
The materials for making compost upon a farm are almost innumerable; and leisure hours, which would otherwise be lost, may be employed in collecting them. Another extraordinary mean of fertilizing the earth is frequent ploughing. This work, especially when performed at particular times, is highly useful. It separates the unproductive masses, and opens the soil more fully to the impregnations of that vegetable nourishment which is contained in rain, dew, and even the air itself. Ploughing land when the dew is on the ground is very beneficial. I may add, that the ploughing in of stubble as soon as the crops are off, is of much consequence.
{47} Wet land should be drained, and, when practicable, land comparatively high should be overflown. The soil of the former should, in some cases, be spread upon the latter; and that of the latter applied in the same way upon the former. Overflowing may sometimes be employed conveniently and to much advantage.
I have said that moisture is absolutely necessary to vegetation. This country is rather subject to drouth than
