Glass, impermeable to the electric

fluid,

Gralath first employs a battery,
Grey distinguishes electrics from con-
ductors, p. 646. note (B).
discovers silk to be an electric, 16
supposes a perpetual electricity

113

Leyden phial, discovery of, N° 97
progressive improvement, 100
best form of,
103
insulated, cannot be

Luminous conductor,

Lyncurium, the tourmalin so called by
Theophrastus,

Lyons's experiments to prove the per-

charged,

122

meability of glass,

N° 188

N° 20

409

charge of, where seated, 123
gradually discharged,

M

125

Machine. See Electrical.

in sulphur,

Gymnotus electricus,

H

27

lateral explosion of,

127

542

Brooke's experiments

Magnetism given to needles by elec-
tricity,

276

Milner's experiments

Maimbray first electrified plants, 526
Marum's, Van, electrical machines, 48, 49

batteries, 114

states of its surfaces, 134--140

experiments with the

488

Haldane's, Colonel, mode of estima-

tion,

ting the charge of a
battery,

Hauy's discoveries of the electric
properties of minerals,

204

charged without fric-

when damped within,

receives a higher
charge,

gases,

N° 166

N° 148

205

netic needles,

278

22

Hawkesbee's experiments on glass,
renders sealing-wax trans-
parent,

13

Franklin's theory of, 291
phenomena of,illustrated, 415

483

theory of,

416

Medical electricity,

545-

ib.

Henley's experiments on chocolate,

28

charge of, how ascer-
tained,

Mercurial phosphorus,

14

420

quadrant electrometer,
universal discharger,

observations on charged
- plates,

atmospherical electricity, 490

Houses, best means of protecting from

67

Lichtenberg's method of estimating.

Metals fused and oxidated by electri-
city,

171

117

small degrees of e-
lectricity,

242

fusibility of, comparative, by
heat and by electricity,

152

curious experiment with

N° 172. and p. 701. note

the electrophorus,

274

(x).

Light differs from electricity,

360

oxides of, reduced,

174

lightning,

I

477

electric, varieties of,

91

fusion of, by lightning not a

Ice, when free from air, a non-con-

first seen by Otto Gue-
ricke, p. 673, note (N).
star and pencil of

cold fusion,

454

Milner's observations on the Leyden

129

phial,

141

appearance of, on paper, 133
experiments on, by Mr
Morgan, 182-187

Monnier's experiments on atmosphe-
rical electricity,

482

Morgan's rules for constructing bat-

may become visible in
all bodies,
more visible in imper-
fect conductors,

teries,

102

182

for discharging rods, 118

discharging rod,

119

183

experiments on electric

experiments on the insula
ted electrophorus,

light,

182-187

209

185

experiments on the non-

conducting power of a

186

vacuum,

238

observations - on the effect

of friction,

364

observations on the distance

vacuum,

237

at which thunder may

Cavallo's construction of,

492

directions for making experi

Lightning and electricity, similar ef-
fects of,
identity of, proved
by Dr Franklin, 441

439.

strike,.
proposal for preventing dan-

ger to buildings from
lightning,

460

flash of, form of,

446

Kleist's, Van, discovery of the elec

colours of,
effects of, on a building, 453
fusion of metals by, not a

447

Multiplier of electricity,
Multiplying wheel, its uses,

477"

255

41

N

242

cold fusion,

454

Lamp, inflammable air,

161

sets fire to inflammable bo-

Lane's electrometer,

Lateral explosion,

Leyden phial, construction of,

95

kills animals,

457

charging and discharging, 96

Luminous word,

181

method of securing jars,
Neutral points, several in an imper-
fect conductor,
Neutrality of bodies that are redun-
dant or deficient,

121

346

313
Nicholson's