A VARNISH WITH WHICH COLORS MAY BE MIXED, AND VERY SUITABLE FOR COATING ARTICLES IN GUTTA-PERCHA.—Take 100 lbs. gutta-percha, 18 lbs. 12 oz. gum opal, 50 lbs. linseed oil, 200 lbs. spirits of turpentine, and mix the whole together. A VARNISH FOR UNPAINTED ARTICLES IN ROUGH WOOD.—Take 50 lbs. India-rubber, 100 lbs. gutta-percha, 30 lbs. gum opal, 70 lbs. gum damar, 150 lbs. linseed oil, 75 lbs. sugar of lead, 500 lbs. spirits of turpentine. A VARNISH FOR ARTICLES OF METAL.—Take 100 lbs. gutta-percha, 20 lbs. gum opal, 75 lbs. linseed oil, 25 lbs. sugar of lead, 200 lbs. spirits of turpentine. W. JOHNSON. Improvements in the treatment, preparation, or manufacture of sheet caoutchouc, and in the combination thereof with cloth and other fabrics. (A communication.) Dated October 3, 1856. This relates to a mode of preparing sheets of caoutchouc, and combining them firmly with cloth and other fabrics, to produce goods for the manufacture of articles of various degrees of elasticity, and consists in preparing sheets of vulcanized caoutchouc, by desulphurizing their surfaces by first boiling the sheets in caustic alkali, and afterwards in salt pickle, to neutralize the alkali remaining on the sheet, and then washing the same. These sheets are then roughed on their surfaces, and the fabric to which they are to be applied is prepared by coating the surfaces thinly with a solution of caoutchouc dissolved in some solvent, and then thoroughly evaporating the solvent. F. C. JEUNE. An improved manufacture of floor cloth. Dated May 26, 1856. The patentee mixes in a masticating machine, India-rubber, (partly the waste of vulcanized rubber) and gutta percha, to produce a binding substance, and throws in ground cedar wood, or other vegetable dust, for increasing the bulk, and reducing the cost. When the mixing is effected, he adds fibrous substances in length, to impart toughness, and rolls the compound between rollers into sheets, which he submits to steam or hot air, to complete the adhesion of the particles. C. GOODYEAR. An improvement in combining gutta-percha and asphalt or pitch. Dated August 30, 1856. This consists in combining gutta-percha with asphalt or pitch, by the aid of hot water. They are, when desired, further combined with sulphur, with India-rubber, or other matters; and compounds are, when required, subjected to high temperature. A. LORIMIER. An improvement in re-working vulcanized India-rubber. Dated October 20, 1856. This consists in preparing the waste of vulcanized India-rubber by crushing the same between pressing rollers, then subjecting it to a considerable degree of heat, and whilst so heated causing it to be stirred, by which means the mass is progressively brought into a fluid state. It is then allowed to cool, but before becoming cold, a solvent of India-rubber is added, by which an India-rubber cement is produced.