Digest of comments on The pharmacopia of the United States of America and on the National formulary .. 1905-1922 . lii:. 64.—.ShowinK how a cesspool located on high ground may fail to pollute a well lower : Practical Hygiene; Phila. and N. Y., 1901, p. 324. t hrougli a porous soil that has become saturated or finally by the in-tentional or accidental introduction of impurities, it is necessary toguard against each of these sources. To guard against the pollution of wells the location is of impor-taiK;e. Where it is possible the ground sliould slope away naturallyon all sides, an
Digest of comments on The pharmacopia of the United States of America and on the National formulary .. 1905-1922 . lii:. 64.—.ShowinK how a cesspool located on high ground may fail to pollute a well lower : Practical Hygiene; Phila. and N. Y., 1901, p. 324. t hrougli a porous soil that has become saturated or finally by the in-tentional or accidental introduction of impurities, it is necessary toguard against each of these sources. To guard against the pollution of wells the location is of impor-taiK;e. Where it is possible the ground sliould slope away naturallyon all sides, and the pump siiould be on top of a mound whicii shouldbe well sodded or cemented all around. Sources of domestic or ofotlier jiolhition should be separated from tiie well by an imperviouslayer below ground to avoid tiie danger of pollution from seepage. Figure 64 siiows how a stratum of rock may protect a well fromI)()ilution, even wiiere tlie drainage is toward the well. 583 The following figure shows how a cesspool may pollute a well,I even though the cesspool is at a lower level than the tup of the well:. Fio. 55.—Showing pollution of a wtll lj\ a ^L?s^poulHarrington: Practical Hygiene I than the top of the well. Phila. and N. V., 1901, p. 324. The grounil immediately around the well should be protected fromstray animals by a fence or otherwise. The shaft of the well shouldbe thorouglily tight and for tliis reason the use of terra cotta tiles ormetal pipe, for the shaft is to be preferred to walling up with bricksand mortar. In anj- event the space immediately around the shaftproper should be puddled with clay or cement, or, as advised by Koch,have the uj^per part packed around with sand. The use of open wellsor even the use of chain pumps is not to be recommended, since theyare more or less liable to pollution from the introduction of impuritiesdown the shaft. In all cases the well should be guarded by a tightcoping and cover. A device sometimes resorted to, and which is
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