means of small flanged tubes with collars by means of cement, for producing a steam and water-tight joint between the said boiler tubes and the end plates of tubular steam boilers. Second, the construction and employment of a mandrel for facilitating the cleaning of tubes in tubular boilers.

E. S. BOYNTON, of Alexandria, Virginia, for an improvement in iron masts, steeples, &c.: He claims the constructing of masts and spars, and such perpendicular structures as require height and stability, by means of flat bars of wrought iron or steel, made continuous by riveting the ends of the bars together, and winding them spirally around from the bottom to the top of the structure, one portion winding around in one direction and the other portion winding around in the reverse direction, so as to form spiral or diagonal braces throughout the structure, secured together at the points of intersection, and relying on said continuous braces for their support, without the aid of longitudinal or circular ribs or any internal framing, substantially as described.

G. M. COOPER, of Litchfield, Michigan, for an improvement in press for packing wool: He claims the two adjacent vertical fixed sides, two adjacent hinged and movable sides, supporting and guide rods, sliding yoke, and piston, the whole being combined and operating together in the manner set forth.

PHOTOZINCOGRAPHY.

At a meeting of the British Association for the Advancement of Science, held in September last, Col. Sir H. JAMES, R. E., described the process of "photozincography," by means of which photographic copies of the ordnance maps are cheaply multiplied, either on their original or on a reduced or enlarged scale. The process is applicable to the reproduction of old manuscripts and old printed books. A copy of Domesday Book (the part relating to Cornwall taken by this means) was exhibited to the meeting. The process consists in taking a photographic collodion negative, which is intensified by means of bichloride of mercury and sulphate of ammonia. Paper deprived of its size is saturated with a solution of gelatine and bichromate of potash. The paper thus prepared is exposed to the light beneath the negative, the result of which is, that the parts which have been exposed to the light become hardened and insoluble. The whole is then inked with a greasy ink, and afterwards washed in water, which removes the ink from all the parts except those on which the light has acted. A transfer to stone or zinc is then taken in the ordinary way, and copies are printed. Sir HENRY JAMES then described an improvement which had lately been made in the process, by means of which a reduced copy of a map or plan could be made, in which the minor detail (which would be useless on a reduced scale) could be omitted, and the names of places and other features of the plan given in full-sized legible characters.

Average for last 18 months, 9,752 tons, against the previous 18 months, 5,673 tons.

Stocks, Receipts and Distribution of Coffee in the six principal Depots of Europe, up to 1st December.

STOCK 1ST DECEMBER.

Total supply for 11 months,..
Deduct stock, December 1st,

88,850

40,850