THE

INDEX.

A.

A PPARATUS, Electrical, described,3°- 34- 37- 57- ioi. 103, 104, 118.126. 128, 129. 132. 142. 177.Amber excited, supposed to emit effluvia,

8 .

—-- according to Boyle, acquires an

attractive virtue by heating, 182.

Action and re-action equal, 26.

Air, a plate of, so called by electricians,said to be charged, 21.

——> condensed, its resistance very great,

56.

■-not a conductor of the electric fluid,

5 j ♦

--when confined and rarefied, repels

the electric effluvia, 53.

--may be placed among the first class

of electrics, 205.

•-inflammable, rises from ditches and

stagnant waters, 234.

Aurora australis, seen by Captain Cook,236.—Do not refract the rays of light,2Z7-

«-- borealis, seldom seen near the

æquator, 236.

—--, a remarkable one seen in

England, 1716. 236.

<--, supplied with inflamma-

ble matter from the earth, 239.

--- —--, its effluvia not visible,

unless passing from body to body, 241.——— , its effluvia conducted to-

wards the vertex by thin broken clouds,242. ,

Æpinus, his opinion of electrics, 24.

Atmosphere, terrestial, prevents gross andother bodies flying off from the earth,205.

_____ an assemblage of all

kinds of matter, 215. 222.

—— - - electric, its laws of motion, 23.

-■ —— its doctrine examined, 24 to 39.

- - - — acts obliquely, 106.

. . - . its manner of acting farther con-sidered, 143.

Attraction, electric, laws of, 3 and 4.

-- - the theory examined, 24.

-mutual between the coatings of

two jars charged at different conductors,63.

- -- - - the fame between two magne-tic needles, 64.

--—— mutual between two electrified

gilt vanes, 68 . 122.

--, a property in the first particles

of matter, 77.

- ---, the grand machinery of the

solar system kept in motion by it, 77.

--— of gravity, magnetism, and e-

lectricity, reaches to sensible distances,

77 -

—- stronger on one side of the fameparticle of matter than the other, 81.98.

»__™ stronger between the particlesO o of