purposes where Hard, Dense & Adhesive a close governing engine is indispensable, —DOES NOT— 2, = ia !. CHECK or €RACK. FIRE-BRICK.—BY R. A. COOK, A.M, It is impervious to wind, ‘__. water, and disease germs. An interesting description of the mining of fire clay and iv It dries in a few hours. the… … College course.—An elaboration of a system for the management of factories and employes. A valuable Encyclo- Diamond Book free, paper. Contained in SCIENTIFIC AMERICAN SUPPLE- ELECTRIC WELDING.—A PAPER BY pedia of Drills and 25c. for MENT. NO, 605. Pricel0cents. 'l'o be had at this office joo…
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