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Full text of "Pathogenic Bacteria"

B^LCTERIOLOGIC EXAMINATION OF WATER.  173

the filter, the benefit is not permanent. The filters must
frequently be renewed. Porcelain filters seem to be the
only positive safeguard, and even these, the best of which
seems to be the Pasteur-Chamberland, allow the bacteria
to pass through if used too long without renewal or with-
out firing.