Abstract
During the past thirty years a great change has taken place in medical opinion concerning the causation of acute infectious diseases, and particularly of typhoid fever; and it is gratifying to know that every step of this change has been productive of material sanitary improvements.Murchison'spathogenic doctrine became a potent factor in removing filth and giving us the relative cleanliness of the present time, whileDr. William Budd'stheory of specifically infected dejecta, with the sewers as a continuation of the diseased intestine, led to the construction of improved sewerage systems. Faulty sewers came to be regarded as hot-beds of typhoid infection and sewer air as the medium by which it was propagated. The efforts made to exclude the latter from our houses educated the plumber, elaborated plumbing regulations and preserved us from many foul emanations. The discovery of the bacillus of typhoid and the infection of water by
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