ii'.tS llder and Browning — Electrolysis, etc. 



hydrogen generator that the hydrogen was dried hy passing 

 through strong sulphuric acid. AVhile the current of hydro- 

 gen was passing through the tuhe the full heat of the Bunsen 

 burner was applied directly under the hoat, and the heating 

 was continued until no further sublimate appeared. This was 

 determined by moving the hoat from time to time and examin- 

 ing the tube above it. The boat and its contents were then 

 allowed to cool in the current of hydrogen, and when cool 

 were removed and weighed. A loss of O0008 grm. was 

 observed, and the contents of the boat, tested spectroscopically, 

 did not give the slightest trace of the strongest zinc lines. 

 The amount of sublimate in this experiment was too small to 

 be removed for examination, but a much larger sample of the 

 metal, similarly treated, gave a sublimate which proved when 

 examined spectroscopically to be chiefly zinc. 



Yale University, New Haven, Conn., August, 1916. 



