and sagacious conjecture of Sir Isaac Newton, that the refractive power of

bodies increases with their inflammability. Carbon, phosphorus, and sulphur, being the only three simple inflammable substances, have actually their refractive powers in the very order of their inflammability.

In the experiments on solids, a me. thod was employed by which the refractive powers could be obtained merely by using irregular chips of the transparent solid, without any part of the surface being ground or po lished.

The same gentleman is engaged in a set of experiments on dispersive powers, which are measured by means of a new instrument for that purpose; and he has found that oil of cinnamon is the best fluid for achromatic fluid object glasses. It requires more than four prisms of crown glass to correct the colour of one prism of oil of cinnamon.

Jan. 15. For a new and improved method of regulating the texture of all kinds of cloth in the process of weaving. To William Cotton of Limehouse, manufacturer.

Jan. 15. For a process of boring and forming pipes, cylinders, columns, and circular disks, out of solid blocks and slabs of stone, of any kind or description. To William Murdoch, of Soho Foundry, in the county of Stafford, engineer.

Jan. 15. For certain improvements in sliding pulleys for window-blinds, and for other purposes. To Thomas Bayley, of Birmingham.

Jan. 23. For certain improvements upon the thrashing machine. To Peter Cox, of Fairford, in the county of Gloucester, civil engineer.

Jan. 23. For an improvement in telescopes. To Joseph Martin, of Davies-street, Berkeley-square, gunmaker.

Feb. 1. For vessels of a new construction, for melting and heating

fluids. To David Cock, of Deanstreet, Soho, in the county of Middlesex, stereotype manufacturer.

Feb. 1. For certain improvements on printing and stamping presses. To Augustus Frederick de Heine, of Moor-lane, Fore-street, in the city of London, gent.

Feb. 1. For a method of making an improved kitchen fire-place. To John Craigie, of Quebec, in the province of Lower Canada, in North America, Esq., now residing in Craven-street, in the county of Middlesex, who, in consequence of communications made to him when residing abroad, and certain inventions of his own, is in possession of this method.

Feb. 1. For certain improvements in steam-engines, and in distillation. To Stedman Adams, in the city of Hartford, in the state of Connecticut, in North America, Esq., at present residing in Carey-street, Lincoln's Inn Fields, in the county of Middlesex.

Feb. 12. For an improvement in the combination of wheels for gaining mechanical power. To William Doughty, of Birmingham, in the county of Warwick, engineer.

Feb. 12. For certain improvements in the construction of wheel carriages of various descriptions. To George Wyke, Esq., of the city of Bath.

Feb. 14. For a new method of decorating china, porcelain, earthenware, and glass, with native, pure, or adulterated gold, silver, platina, or other metals, or fluxed or lawered with lead, or any other substance; which invention leaves the metals, after being burned, in their metallic state. To Peter Warburton, of Corbridge, in the county of Stafford, china manufacturer.

Feb. 14. For certain improvements in making, arranging, and combining certain parts of rotative steam-engines, by which means the most complex parts of the steam-engines now in use are dispensed with, and rendered unnecessary, and the whole of the mechanism made much more simple, less expensive, and not so liable to be out of repair, as that of the steam-engines now in use, and applicable to giving motion to all sorts of mill-work or machinery. To Richard Witty, of the town of Kingston-upon-Hull,

goods from warehouses, and other purposes. To Eneas Morrison, of the town of Greenock, in Scotland.

Feb. 26. For a method of engraving and printing maps of counties, charts, or other plans or designs, music, mathematical diagrams, or figures on wood, metal, or any other substance, so that they may be thrown off in a common printing press or presses, either for books, newspapers, or any other printed paper whatever. To Peter Stuart, late of Fleet-street, in the city of London, printer.

Feb. 26. For certain improvements on the English flute and flageolet. To William Bainbridge, of the parish of St Andrew, Holborn, in the city of London, musical instrument maker.

Feb. 26. For certain methods of manufacturing machines for performing various agricultural operations by mechanical powers. To Major Pratt, of Spencer-street, St George's in the East, in the county of Middlesex, farmer.

Feb. 26. For certain apparatus, by the application of known principles, to preserve animal food, vegetable food, and other perishable articles, a long time from perishing or becoming useless. To Augustus de Heine, of Burr-street, in the county of Middlesex, gent.

Feb. 26. For certain apparatus to be added and united to the axle-tree, and wheels or naves of wheels of carriages, so as to impede, resist, or check their action. To Charles le Caan, of the town of Llanelly, in the county of Caermarthen, gent.

Feb. 27. For a machine for filtering and purifying water. To Joseph Stephenson, of Mortimer-street, Cavendish-square, in the county of Middlesex, plumber.

March 6. For improvements in the

construction of stone grates, calculated to prevent or cure smokey chimneys, and possessing other advantages over the stone grates in common use. To John Justice, of Dundee, in North Britain, ironmonger.

March 12. For an improved German flute, clarionette and oboe. To Thomas Scott, of Holborn, in the county of Middlesex, musical instrument maker.

March 12. For a mashing machine. To Thomas Robinson, of Robertsbridge, in the parish of Salehurst, in the county of Sussex, brewer.

March 12. For a new and expcditious method of moving all kinds of goods or materials to high buildings, or from deep places. To John Kent, of Southampton, architect.

March 22. For a method of making paint or varnish from a new discovered fossil, which will be of great public utility in painting of ships, and in various manufactories. To Thomas Grant, of Bideford, in the county of Devon, Esq.

March 22. For certain improvements in the art of brewing, which were communicated by a learned foreigner, since deceased. To Michael Shannon, of Berwick-street, in the county of Middlesex, architect.

March 22. For a machine, new principle, or method of making bricks and tiles; and also by means thereof, and of clay, loam, or similar materials, to those commonly used in potteries, to make all sorts of mouldings, heads, tubes, gutters, channels or cylinders, to convey water, smoke, or any fluid or soft substance. To Johann George Deyerlein, of Long-Acre, in the county of Middlesex, tool maker, in consequence of certain inventions of his own, and of communications made to him by a native of Germany.

March 22. For a new method of tunning or cleansing ales and beers into casks. To John Gregory, of Islington, in the county of Middlesex, builder.

March 29. For a method of printing by means of machinery. To Frederick Koenig, of Cambden Town, in the county of Middlesex, printer.

April 6. For an improved method of preparing rollers and blocks used for calico printing. To Jonathan Ridgway, of Manchester, plumber and glazier.

April 6. For certain improvements in apparatus for the combination and condensation of gases and vapours applicable to processes of distillation. To John Stancliffe, of Caius College, Cambridge, batchelor of physic.

April 6. For several improvements relative to canals. To John Woodhouse, of Bromsgrove, in the county of Worcester.

April 6. For a new and improved method or process of increasing the inflammability and combustibility, and of improving the light of oils used for burning, particularly applicable to the oils refined according to the patent process, which will also improve oils refined according to the patent process, and oils when used for burning. To William Speer, late of the city of Dublin, but now of the city of Westminster, Esq.

April 6. For a method of making and working forge and other bellows. To James Fussel, of Mells, near Frome, in the county of Somerset, iron manufacturer.

April 6. For an improvement in the manufacture of woollen cloth. To Charles Frederick Davis, of the parish of Itchcombe, in the county of Gloucester, clothier.

April 11. For improved gunpow

der. To William Parr, of the Portland Hotel, Great Portland-street, in the county of Middlesex, Esq.

May 2. For certain improvements to a bridle-bit, or bits for bridles, used in driving or riding horses or other animals. To Luke Hopkinson, of Holborn, in the county of Middlesex, coach and harness maker. May 2. For a new plan or method for more accurately and expeditiously expressing and ascertaining the number, dates, and sums in bank bills, notes, and other securities for money, and preventing forgeries, frauds, and losses, by defacing or altering the To Daniel Beaumont Payne, of the city of Bath, banker.

same.

May 2. For a method of preventing smoke, dust, and the danger of fire, and for increasing and regulating heat from stoves and chimney fireplaces, for heating rooms, halls, passages, and stair-cases in public buildings and dwelling houses, and all other apartments, where regulated heat and cleanliness are desirable, without obstructing the view of the burning fuel. To William Clerk, Esq., advocate, Edinburgh.

May 2. For certain improvements on piano fortes and harps. To Sebas, tian Erard, of Great Marlboroughstreet, in the county of Middlesex.

May 2. For certain apparatus for making carbonated hydrogen gas from pit-coal, and for using the same for lighting mills, factories, houses, lamps, &c., the lights being regulated by means of syphons. To John Maiben, of Peith, in the county of Perth, saddler and ironmonger.

May 5. For certain improvements on the bugle-horn. To Joseph Halliday, of the Cavan regiment of militia. May 9. For a wheel to be moved by water, &c., and applicable to me. chanical and other purposes. To

William Chapman, of Newcastle-upon-Tyne.

May 9. For improvements on carriages in unloading heavy goods. To John Bosworth, of Birmingham.

May 15. For a perpetual oven for making all kinds of bread. To Sir Isaac Coffin, Bart., in consequence of a foreign communication.

May 17. For improvements on the refining of sugar. To James Bell, of Field-gate Street, Whitechapel.

May 22. For improvements on di. ning tables. To Charles Stewart, St Martins in the Fields.

May 22. For a new threshing machine. To John Onions, of Brosely.

May 22. For improvements in the manufacture of ivory black, and for pulverizing substances by torrefaction, &c. To William Docksey, of Bristol.

May 26. For a new warning watch, To J. A. Berrollas, Clerkenwell, Middlesex.

June 8. For improvements on the plough. To G. Hickford, Suffolk.

June 8. For rendering wheel carriages more safe and commodious. To J. Williams, of Cornhill, London.

June 8. For curing smoky chimneys. To Mary Townley, of Ramsgate.

June 9. For improvements on steam engines. To Arthur Woolff, of Lam. beth.

June 19. For a new method of splitting hides, and shaving leather. To J. Warren Revere, of Boston, America, now residing in London.

June 19. For improvements on gigs and shearing frames for dressing cloths. To J. Clisild Daniell, of Frome.

June 19. For musical instruments with improved keys. To Malcolm Macgregor, of Bell Yard, Careystreet.