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P A R T the First;:'

CH A P.T. W/ Origin, Antiquity, end
Progress of Electricity. Opinions ofva-
rious Authors on Air, , • -, » page-*

Chap. II. &r Isaac Newton J Rules of Reason-

ing in Philosophy. And, the Author'$ first

Principles. . , 2q

Chap. III. Experiments, which stew, that the

Electrical Fluid is endued with the two inhe-

rent or essential Properties of Æther, and in a,

most surprising degree, namely< those os extreme

Rarity and extreme Elasticity, """ 30

Chap. IV. Intumescence, &c. os an elastic Fluid,

Chap. V. Farther accounts of the wonderful

essential Properties of Mt her, .. -« V. .67

Chap. VI. Lord VerulamV Conjectures concern*
ing a subtile Fluid, with the Authors new ac-
count os a more rare and active part of Æther
to which he gives,the natne ofPntunta or Spi-
^ rit of Æther. ~*

Chap. VII. Mr. Haukelbee's Experiments con~
tinued, with others, tending to point out the

fame agent, by means of its excejive rapid mo-

tion towards the part most rarefied, 86


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