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Of the Attra&ion of Electricity.

(3.) It varies with the State of the Wea-ther, being greatest in hot and dry Wea-ther, but weaker in warm and moist.(4.) It may be communicated to a greatDistance, viz. seven or eight hundred Yards,by the Intervention of a proper Body, asHempen Strings, &c. (5.) This Virtue is

excited by Attrition, or hard Rubbing, bythe Hand or with a Piece of Cloth, butwill not be produced by the Warmth ofFire. (6.) It penetrates or pervades thePores of Glass; and, (7.) It may be com-municated to other Bodies, so as to renderthem electrical. (8.) If the Sphere of At-traction be interrupted on any Part, it de-stroys the Efficacy of the Whole. (9.) Bythis Virtue Bodies are not only attracted,but also repelled alternately to a verysensible Distance, and with a surprisingVelocity. (10.) The Body once repell’dfrom the Tube will not be again attractedby it,? till it has first touch’d some otherBody. (11 .*) Bodies attracted, and stick-ing to the Tube, will be then attractedby other Bodies not electrical; as the Fin-ger, &c. (iL.) This Virtue will exert it-

self in Vacuo , as well as in open Air. (13.)It appears lucid, and sparkles like Fire, ina dark Room. (14.) It is also sensible to

the