tion 125
Brimstone and Charcoal, to meal for Fire-works 165

Halo, artificial 80
Horn, to make Moulds of 134
to soften 134
Hour of the Day or Night told by a suspended Shilling 152
Hydrogen Gas, to procure 159
to fill a Bladder with 159

Illuminations, artificial 22
chemical 36
Illusion, alternate 146
Incendiary, unconscious 88
Indromacus 103
Ink, invisible 23
Gold, Silver, Yellow, Red, Green, Violet,
and Grey 24, 25
secret Correspondence by Means of 25
golden 41
white 42
Iron, transformed into Copper 36
Silver 36
melted in a Moment and run into Drops 37
or Steel, to soften 135
Ivory, to cast Figures in Imitation of 134

Kings, the four inseparable 116
Kite, electric 87

Lamp to burn twelve Months without replenishing 29
Chronometer 46
Landscape, artificial 66
to draw correctly 67
Lead, metallic, produced from the Powder 141
Leech, a Prognosticator of Weather 157
Leyden Phial 94
Light, rays of 143
refraction of 144
travelling of 145
Lightning,