pu- of minute particles of decomposing animal and veg- rify the impure air for respiration, to dry it when too etable matter floating in the air of cities, and more damp, and, in summer, to cool it—somewhat as we or less in all inhabited districts. There are also the would filter, purify, and cool… … over 4° or 5°, merely elements arestored away. enough to keep up the cir- The most disgusting culation through the df- gases—the products of infecting material. putrescence—-are sul bed, a8 shown in Fig. 1. In hot weather the ice phureted hydrogen and compounds of ammonia: In the lower part of the…
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