delivered at St. Louis. The total number of miles of railroad in operationJanuary 1 1874 was 71109 as against 67104 a year back. Increase OZONE—A NEW AND CORRECT METHOD OF SUPPLY. wholesome and inexpensive means of freeing our houses from noxious exhalations and the long train of evils attend eat on the prevalence of bad air. The matter is easily tested and certainly well worth trying. EDUCATION AND BOOK KNOWLEDGE. The high water mark of a very prevalent theory in educa tion is reached in an assertion by one of the foremost edu THE IRON ORES OF MISSOURI., scientific american, 1874-02-21
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