VI. Parallel, diverging, and converging Rays 52
VII. Images of Objects-Scioptric Ball, &c.
VIII. Nature and Advantages of Light

60

67

Conversation

XIII. Concave and Convex Mirrors

Page

101

XIV. Optical Deceptions, Anamorphoses, &c. 107

XXVII. Early History of Electricity

XXVIII. Electrical Attraction and Repulsion

XXXI. Electrical Attraction and Repulsion
XXXII. Electrical Attraction and Repulsion
XXXIII. The Leyden Phial
XXXIV. Lane's Electrometer, and the Elec-

trical Battery

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-

211

217

226

234

242

254

259

268

Conversation

XXXV. Experiments with the Battery

XXXVI. Miscellaneous Experiments

Page

276

287

XXXVII. Electrophorus, Thunder-House, &c. 295

XXXVIII. Atmospherical Electricity

XXXIX. Aurora Borealis ; Water-spouts;

301