Portland Cement
So called from its near resemblance to Portland stone in color. It not only possesses the property of setting more quickly, and has greater power of cohesion than the natural cements, but it may be used with a superabundance of water in the form of grout, which they cannot be. This cement is made from Westmacott's patent carbonate in combination with chalk, gray, and all other limes. All the carbonic acid being removed from the lime in its burning, 75 per cent of this acid is restored by its mixture with the prepared patent carbonate.