conductor, 267

Sulphur, excited, phenomena of, Part I. Chap. v.

experiments on, by Wilcke, 26 by Æpinus, 27 durability of its electricity, 28

Swinden's, Van, experiments to show that powdered glass is a conductor, 269

Symmer's experiments on silk, 17 on charged plates, 151 on the perforation of paper, 196

T