had acquired in the reduction about a decigramme, or one-twentieth of its weight, of potassium.

To verify this theory, I melted in a glass tube, closed at one end, one gramme of pure antimony with a decigramme of potassium; an alloy, similar to the former, was produced, which gave out pure hydrogen when wetted. Zinc and lead, melted with a tenth part of potas sium, acquired new physical properties, and became hard and brittle, but they did not decompose water.

Further experiments must inform us, whether the same. change takes place with the other ductile metals. It is probable, however, that many other metals, when reduced by tartar or alkaline fluxes, contain a portion of potassium, which may modify their properties till it is dissipated by refining in contact with air.

AUGUSTUS

List of Patents for Inventions, &c.

(Continued from Page 320.)

UGUSTUS SIEBE, of No, 6, Crown-street, Soho, Middlesex; for an improved weighing machine. Dated April 5, 1819.

WILLIAM BUNDY, of Camden Town, Middlesex, Mechanical Instrument maker; for certain machinery for breaking hemp and flax. Dated April 1, 1819.

PAUL SLADE KNIGHT, of Lancaster Moor, Lancashire, Gentleman; for an improved kind of fire-engines, pumps, and other engines; in which are used pistons working in barrels or cylinders. Dated April 3, 1819.

JOHN SEAWARD, of Kent Road, St. George, Southwark, Engineer: for a method or methods of raising or producing steam, for the purpose of working steamengines and other apparatus. Dated April 3, 1819.

HENRY

HENRY PETER FULLER, of Piccadilly, St. George Hanover-square, Middlesex, Surgeon and Apothecary; for an improvement in the methods of procuring or preparing sulphate of soda, soda, subcarbonate of soda, and. muriatic acid. Dated April 3, 1819.

PHILIP PINDIN, of Farningham, Kent, Shoe-maker; for an improvement on single and double trusses. Dated April 20, 1819.

JOHN SMITH, of Bermondsey, Surrey, Timber Merchant; for improvements in making arms or axle-trees for coaches, carts, waggons, and all other descriptions of carriages. Dated April 20, 1819.

ERRAT A.

Page 289, line 10, for Plate IX. read Plate XI. 297, line 4 of the title, dele the whole line.

END OF THE THIRTY-FOURTH VOLUME.

INDE X

TO THE

THIRTY-FOURTH VOLUME, SECOND SERIES.

A

Page

ACETATE of Alumine, on its decomposition by heat,

317

Acid, malic, experiments on it,

376

247

memoir on its different compositions,

308

70

Sorbic, experiments on it,

Ackermann, Mr. Patent for improvements on axletrees,
Alkali, mineral, on a new species of it discovered in the

petalite,

Almonds, sweet, analysis of them,

Ambrose, Mr. Patent for a pump of a peculiar sort,

126

378

65

Amorphous metal plates, patent for making them,
Axletrees, patent for improvements in making them,

198

70

B

Bank-note, description of an American one,

207

Barnard, Sir Thomas. On the use of salt for feeding cattle, 41

Page

Blakemore and James, Messrs. Patent for a new kind of
plates, denominated amorphous metal plates, and like-**
wise a certain improved and more perfect method of ren-
dering crystalisable the surface of tin plates, or iron or
copper plates tinned,

Boullay, M. Analysis of sweet almonds,

1198

Braconnot, M. Chemical examination of Guinea pepper,
its acrid principle, and that of plants of the family of the 4
ranunculi,

On the sorbic acid,

Brass, patent for plating it, &c.

Bridges, method of widening them,

378

181

308

10

$269

C

Calderbank, Mr. Patent for certain improvements in the
working of pumps,

68

Calico-printing, patent for making rollers for that purpose, 266
Carriages, patent for certain improvements on them,

patent for improvements on them,
observations on the above,

patent for improvements on them,

Cattle, on the use of salt for feeding them,

Cawood, Mr. On gas retorts,

Chaff-cutting machine, patent for one,

Chess-player, observations on the automaton,

Chimnies, patent for regulating their draught,

70

257

261

342

41

361

262

297

193

201

888

patent for sweeping and ventilating them,
--report of the surveyor-general on the practica-
bility of superseding the necessity of climbing boys in
sweeping them,

1

Chronometers, patent for perfectly detaching the escapes
wheel from the influence of the friction, and inaccuracies
arising from the main spring, pivots, &c.

observations by the Patentee,

238

1

5

Chubb,

Chubb, Mr. Patent for certain improvements in the con-
struction of locks,

Description of an American bank-note, with
observations and hints on the means of preventing for-

,geries با هم

Cleland, Mr. Patent for improvement in bleaching flax and
hemp, and also of bleaching yarn and cloth, or other
goods made of either of those articles,

Cloth, patent for bleaching it,

Page

321

cotton or linen, patent for improvements in the pro-
cess of printing them,

Copper, patent for plating it,

Corty, Mr. Patent for certain improvements on, and addi-
tions to stills, or the apparatus used for distilling, and
also in the process of distilling and rectifying,
Crane, description of a self-adjusting one,

207

12

ibid.

129

10

6

154

1

D

Davy, Sir H. New experiments on some combinations of
phosphorus,

286, 351

Distilling, patent for improvements and additions to stills,
or the apparatus used for distilling, and also in the pro-
cess of distilling and rectifying,

6

Farquharson, Mr. Observations on the nature of the injury

that grain suffers from frost, &c.

Fire-arms, patent for improvements in them,

Flax, patent for bleaching it,

Friction, patent for a machine for acquiring very great