I 453 ] 
E. 
Earth of alium % or argillaceous earth. See Saline Subjiances . 
Eledricity. Of the method of rendering very fenfible the weakeft natural or artificial 
eledricity, by Mr. Alexander Volta, p. vii. [See the original Italian, p, 237.]. 
Advantages of his eledrophorus in investigating atmofpherical eledricity, ibid. 
Ordinary conductors are never entirely void of electricity, ibid. Defcription and 
management of the eledrophorus, viii. ct fcq. When proper to ufe that apparatus, 
and when nor, xi. Ufe and advantages of imperfed conductors, xii. Marble Ilabs 
or boards preferable to all other planes, for imputed conductors, ibid. Not ever/* 
fort of marble equally proper, xiii. Metal plates, by means of varnilh, may be 
nfed inflead of marble, ibid. Advantages or a varmfhcd plate above the commou 
eledrophorus, xiv. Other planes may be fubllitujed, with equal advantage, intleaj 
of matble or metal, ibid. Mr. Canton’s afl'ertion, that ftron^er figns of eledricicity 
may be obtained at the time of an aurora borealis than at any other, confirmed, p. 
xv. Better method than Mr. Cavallo’s of difcovering the eledricity of certain 
bodies, p. xvii. The eledric fpark obtained from the evaporation of water, p. xviii. 
xxix. And from various cffervefcences, which produce inflam .able, fixed, and 
nitrous airs, xix. The metal place has a much greater capacity xor holding eledricity 
in one cafe than in others, ibid. The intenfity of eledricity mull be inverfely pro- 
portional to the capacity of the body eledrified, p. xx. The capacity of condudors 
is not in proportion to the furface in general, but to the furfaces which are free, or 
uninfluenced by an homologous atmofphere, p. xxi. What the author means by a 
conjugate condudor explained, ibid. Various experiments in confirmation of the 
author’s ailertions, ibid, et leq. Why an eledrified body parts with its eledricity 
calier, a d from a greater diftance, \\ hen a pointed condudor than when a flat or 
globular one is p relented to it, p. xxv. Ufefulnefs of Mr. Cavallo’s fmall or fecond 
condeufer, p. xxviii. 
Eledrometer. Account of a new one, by Mr. Abraham Brook, p. 384. Explanation 
of the plate, ibid. Method of making the divilions, p. 386. And of graduating 
the inflrument, ibid. Its advantages above thofe in ufe, p. 387. 
Eledrophorus. See Eledricity. 
Equation. A new method ot finding the equal roots of an equation by divifion. By 
the Rev. John Hellins, p. 417 — 423. 
Etna , Mount. See Rain. A flight earthquake there, preceded by a remarkable 
column of fmokc, p. v. 
Fye-glajs. See Optics. 
Fin. 
