An encyclopædia of agriculture [electronic An encyclopædia of agriculture [electronic resource] : comprising the theory and practice of the valuation, transfer, laying out, improvement, and management of landed property, and the cultivation and economy of the animal and vegetable productions of agriculture, including all the latest improvements, a general history of agriculture in all countries, and a statistical view of its present state, with suggestions for its future progress in the British Isles encyclopdiaofa02loud Year: 1831 736 PRACTICE OF AGRICULTURE. Tart III. it passes through sof
An encyclopædia of agriculture [electronic An encyclopædia of agriculture [electronic resource] : comprising the theory and practice of the valuation, transfer, laying out, improvement, and management of landed property, and the cultivation and economy of the animal and vegetable productions of agriculture, including all the latest improvements, a general history of agriculture in all countries, and a statistical view of its present state, with suggestions for its future progress in the British Isles encyclopdiaofa02loud Year: 1831 736 PRACTICE OF AGRICULTURE. Tart III. it passes through soft strata; in this case, a second kirb of a smaller size is sometimes begun within the first. When a kirb will not sink from the softness of the strata, or when it is required to stop out water, the bricks or stones must be laid one by one at the bottom of the work, taking care that the work is not left unsupported in such a manner as to let the bricks fall as they are laid : this is called under-pinning. 4180. Noxious air. Well-diggers experience sometimes great difficulty from a noxious air which fills the well, and suffocates them if they breathe it. The usual mode of clearing wells of noxious air is, by means of a large pair of bellows, and a long leathern pipe, which is hung down into the well to the bottom and fresh air forced down by working the bellows. 4481. The use of the auger is common in well-digging, both in ascertaining before commencement the nature of the strata to be dug into, and also in course of digging for the same purpose; and because, by boring in the bottom of a well to a considerable depth, the spring is sometimes hit upon, and digging ren- dered no longer necessary. 4482. T/ie use of the borer alone mat/ procure an adequate supply of water in particular situations. This mode appears to have been long resorted to in this and other countries. From what we have already stated as to the disposition of strata, the conditions requisite for its success wil
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