ardened rapidly. A similarmixture was submitted to a very hightemperature, and in this case, also, acement was made. As a third experi-ment, a similar mixture was heated tillit was fused ; after having been cooledand pulverized, the fused mass did notharden any more under water. Henceit follows… … IRON STORE-FRONTS, No. V.By \Vm. J. Fryer, Jr., with Messrs. J. J. Jackson & Bros., New Yokk. 1869.] Native Colored Marbles. 69 NATIVE COLORED MARBLES. IN the preceding number we havespoken in general terms of this beau-tiful acquisition to our art materials, andindeed we feel that we cannot…
Architecture
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