368 FRAGMENTS OF SCIENCE. 



of diamagnetism are produced by molecular currents, not directed, 

 but actually excited in the bismuth by the magnet. Such induced 

 currents would, according to known laws, have a direction op- 

 posed to those of the inducing magnet, and hence would produce 

 the phenomena of repulsion. To carry out the assumption here 

 made, M. Weber is obliged to suppose that the molecules of dia- 

 magnetic bodies are surrounded by channels, in which the induced 

 molecular currents, once excited, continue to flow without resist- 

 ance.' * Diamagnetism and Magne-crystallic Action, p. 136-7. 



* In assuming these non-resisting channels M. Weber, it must 

 be admitted, did not go beyond the assumptions of Ampere. 



