second, corations have been discovered on the walls, and no doubt does it afford any indication of the length of time during the vaulted surfaces were sometimes also relieved by color. which such differences or stoppages in the intensity of the The existence of plaster on the vaulted surfaces is… … ternal use. Colored calces of iron produce a deep tint, and M. Herve Magnon has invented a ne w apparatus which may be used in internal incrustation. Any colored, hard, satisfies the above want, and an engraving of the device is gritty body may be incorporated with mortar for incrusting here…
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