Trowbridge — Electric Discharges through Hydrogen. 349 



Certain forms of tubes, described in this article, can imitate 

 the action of a transverse magnetic held in apparently increas- 

 ing the conductibility of the rarefied gas and restoring the 

 condition of stratification. 



3. Striae can be formed by condenser discharges; and such 

 striae lead one to suppose a time of ionization beyond our 

 power of measurement. 



By means of a suitably placed diaphragm, successive stages 

 in stratification can be produced. 



4. By modification of the form of discharge tubes rectifica- 

 tion of alternating discharges is possible. 



5. The Doppler effect in hydrogen is not modified by caus- 

 ing two canalstrahlen to oppose each other. 



Jefferson Physical Laboratory, 

 Harvard University. 



