Ts/c.v n 



^m mwmtmmmmmmmmmmm* 



-^ »«««M4tf MM Mlll»> 



«r^ •• ' '^ " '"'r<iWir<it«wnnRrrc*«'^ 



Fig. " — Photographs of the glow-dischnrge in a long narrow rvlintlcr. showing chiclly 



the sulHJivision of the positive column into striations. (De la Rue and Muller, 



Philosophical Transactions of the Royal Socifly) 



