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6These experiments having been made, and the requisite indications being manifest, a well is to be sunk on the spot; and if the head of the spring be found, many other wells are to be dug round about it, and, by means of under-cuttings, connected with it so as to concentrate them. The spring-heads, however, are chiefly to be sought in mountains and northern districts, because, in those situations, they are generally sweeter, more wholesome, and more copious, on account of their being sheltered from the rays of the sun, of the trees and shrubs in those places being in greater abundance, and of the sun’s rays coming obliquely on them, so that the moisture is not carried off.
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