Dr. Siemens showed that there are many "waste products" which,
instead of being turned to profit, are turned to very posi- tive loss. Thus he estimated the weight of the soot in the pall hanging over Loudon on a winter's day—might he not have said on many a summer's day, too P—at fifty tons, and the poisonous carbonic oxide in the air at five times that amount. Here are waste products which we use. to waste art with—for nothing de- etroys our public monuments more effectually—to waste life with, to waste sight with, to waste cheerfulness with, almost all of which, by a little care and address, might be turned to useful purposes Dr. Siemens believed that by using gas as the heat- mg power, instead of coal,—and he believed that gas giving out much more heat than that used for lighting purposes might be provided, with nothing but good effect on the gas used for light, —a greatdeal of this deadly waste might be avoided, and a great economy effected as well. He believed the time to be near when raw coal would be seen only at the gas works.
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