268 



(10) A suggestion is given tliat the stream consists of heated air 

 molecules and ions, in which the latter soon lose their velocity, due to 

 encountering air molecules, and travel to the opposite point with a speed 

 too much decreased to set up an air current, along a route determined by 

 the two fields, while the un-ionized air moves in the direction given it by 

 the ions at the point. 



The above investigation was suggested by Professor Arthur L. Foley, 

 of Indiana University. I wish to thank him and Professor R. R. Ramsey 

 for their helpful suggestions during the course of the investigation. I wish 

 also to thank Professore A. T. Jones and C. M. Smith, of Purdue Univei-sity, 

 tor their criticism during the preparation of this report. 



Physical Laboratori/ of Indiana rniversit}/, 

 Bloomington, Ind. 



