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Proboscis of the hydrometra stagnorum, 140
Puymaurin's heat regulator, 348

Rail-ways, Baader's, 30

Raisin wine, Aikin on making, 115
Rat's hair, 69, 77

Red inks, improved, 85, 86

Red straw, on dyeing, 233

Red feathers, on dyeing, 253

Red enamel, on, 372

Regulating heat, M'Sweeny on, 338

Rennie on friction, 159

Rice paper, Chinese, 174

Rifling-machine for gun-barrels, Gill's improved one, 93
Robertson's improvements in painting in water colours, 245
Sap, circulation of, in a chara, Editor on it, 37, 65

Saws, pit, furnace for hardening them, 9

Scale of the dolphin, 209-Of the chameleon, 336

Scales of a foreign curculio, 77-Of a foreign butterfly, 77
Scarlet sage, farina of, 68, 76

Scarlet pigment from mercury,

Scotch whiskey, on making, 178

151

Screw-cutting tools, Editor on, 292

Screws, Editor on making solid and hollow ones, 289

Screws, Jones on cutting, 258-Editor on making large ones, 261

Ship-building, on improving, 121

Ships, Cary on preventing the dry-rot in, 240

Silicate of iron, 148

Silver and copper, to separate, 177

Skins of animals, Brookes on preserving, 150

Smith's improved melting-pots, 168

Smith on the advantages of the division of labour, 266—On pin-making, 268

Smooth files, Gill's improved ones, 9

Snuffers, Gill's improved ones, 311

Spiders, hairs of, 68, 76

Springs of hammered iron, Editor on, 292

Spurs, on Gill's elastic plated ones, 9

Staphalinus, its antennæ, 140

Steam-bath, Hawkins's domestic medicated one, 294

Steam-engine improved by Watt, 22

Steam employed in destroying white ants, cock-roaches, &c., 101

Steel-works Editor on fine ones, 275

Steel beads and studs, Editor on making, 274

Steel buttons, Editor on making, 280

Stewart on Scotch whiskey, 178

Stone, enamel paintings on it, 184

Straw works, French, 228

Straw, on bleaching, 229

Sullivan, on Winans's rail-way carriage, 23

Sword-blades improved by the late Mr. T. Gill, 12

Symphonion, Wheatstone's; 63

Tallow, an improvement in fusing it, 156

Telescope, graphic, on Varley's, 306

Terredo navalis, T. Carpenter on it, 321

Test-machine, Boulton's, for bending sword-blades, 14

Transfers in lithography, Netherclift on making, 100

Transfer paper for lithography, Netherclift on making, 100

Tully's mode of mounting transparent objects, 315-His micrometers, 315
Twisted gun-barrels, Gill's improved, 312

Tyger lilly, farina of, 68, 76
Unburnt bricks, Chinese, 112

Varley's graphic telescope, on, 306-Chemical lute, 114
Vice-screws, Editor on making, 289

Viper, poison-fang of one, 200, 210

Watch-glass, on a singular whirling motion of a, 19

Waterton on preserving birds, 87

Water-colours, Robertson on improved painting in, 245
Water-filtre, Hawkins's portable one, 307

Water-mills, improved ones, 17

Watkins's galvanic pile, formed of one metal only, 154
Watt, James, notice of, 22

Wax introduced into flour-paste, 114

Wedgewood, Josias, notice of, 20

Wheaten flour and albumen lute, 113

Wheaten flour and gelatine paste, Clay's, 115

Wheatstone's symphonion, 63

Wheel animalcule, Editor on it, 333

Whiskey, Scotch, on making, 178

White ants, &c. destroyed by steam, 101

Winan's rail-way carriage, 23

Winding up clocks, on, 355

Wine, raisin, Aikin on making, 115

Wollaston on malleable platina, 179

Wollaston's microscopic doublet, Gould's, 313

Yellow ink, 86

Yellow straw, on dyeing, 233

Yellow feathers, on dyeing, 254

Yellow enamel, on, 378

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