S 62
count) which would bring a day’s work of single time harrow-ing to ten acres. Doubling will consequently extend to fiveacres ; and what is termed a close double-double, or a fulldouble end-long, and another across, will go over 2^- acres inone day. Hence a single harrowing, on the data assumedin the former section, may cost 10|d.; a double Is. 8j-d. anda double-double, 3s. 4d. an acre.
SECT. III.
OF ROLLING.
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ri i
1 he operation of rolling is employed for various useful pur-poses in husbandry; as, for reducing turnip soil, or land in-tended for potatoes, or land under fallow, into fine tilth, andto admit the harrows to tear out the roots of couch grass andother vivacious weeds, such as knot-grass, docks, and the like;to break the surface clods on land sown with beans or barley,instead of the ancient and more expensive use of the clod-mellor beetle; for finishing off land which has been sown withmixed grass and clover seeds, to facilitate the future operationof the scythe, by making an even surface, bruising all clods,and pressing down small stones which it may not be thoughtnecessary to carry off; to dress the surface of grass land, af-ter mole hills have been spread; and for various other usefulpurposes, all of which will be noticed in the sequel. For theseseveral purposes, some farmers have rollers of different weights,but those most generally useful are of moderate weight anddimensions, forming an easy draught for two horses, andconstrueted of two short cylinders of wood, stone, or cast-metal, by which great facility in turning is ensured.