A kind of weak glue, used in many trades; it is made of the shreds and parings of leather, parchment, or vellum, boiled in water, and strained. Common size is made of leather, boiled in water till it becomes of a viscid consistence. If it is wanted in painting for nicer purposes, it should be prepared by taking any quantity of the shreds or cuttings of glovers' leather, and putting to each pound a gallon of water; let these be boiled for six or eight hours, supplying water, so that it may not diminish to less than two quarts; then strain the hot fluid through a flannel, and afterwards evaporate it, till it is of the consistence of a jelly when cold. The size used in burnish gilding, and made of cuttings of parchment, is prepared much after the same manner.