Thirteenth Series

§ 18. On Induction (continued). ¶ ix. Disruptive discharge (continued)—Peculiarities of positive and negative discharge either as spark or brush—Glow discharge—Dark discharge. ¶ x. Convection, or carrying discharge. ¶ xi. Relation of a vacuum to electrical phenomena. § 19. Nature of the electrical current.

Received February 22,—Read March 15, 1838.