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2499. Marine Glue. In point of strength, all ordinary cements yield the palm to Jeffery's Patent Marine Glue, a compound of India-rubber, shellac, and coal-tar naphtha. Small quantities can be purchased at most of the tool warehouses, at cheaper rates than it can be made. The colour of this glue, however, prevents its being much used. 2500. Coaguline. An exceedingly strong, and at the same time a transparent and colourless cement is made by Messrs. Kay Brothers, of Stockport, and is sold by most fancy stationers and chemists under the name of Coaguline. It is easily and quickly applied, and will be found extremely serviceable in repairing glass, china, and stone articles. It is inexpensive. 2501. Red Cement . Red Cement which is employed by instrument makers for cementing glass to metals, and which is very cheap, and exceedingly useful for a variety of purposes, is made by melting five parts of black rosin, one part of yellow wax, and then stirring in gradually one part of red ochre or Venetian red, in fine powder, and previously well dried. This cement requires to be melted before use, and it adheres better if the objects to which it is applied are warmed. 2502. A Soft Cement for Corks. A soft cement, of a somewhat similar character to that just described, is useful for covering the corks of preserved fruit, and other bottles. It is made by melting yellow wax with an equal quantity of rosin, or of common turpentine (not oil of turpentine, but the resin), using the latter for a very soft cement, and stirring in, as before, some dried Venetian red.