Broivning and Scott — Separation of Germanium. 665 



amount of that reagent. In experiments (6) and (7) 

 some water and less hydrochloric acid was used without 

 interfering with the oxidation. In experiment (8) 

 neither arsenic nor germanium were present, the object 

 being to determine the possible interfering action of 

 chlorine evolved upon the test with hydrogen sulphide. 

 The result was satisfactory. In experiments (9) and 

 (10) small amounts of germanium oxide were used and a 

 very satisfactory result was obtained when only 0-0005 

 grms. was present. Finally in experiments (11) and (12) 

 a mixture of the two oxides was treated according to the 

 method and it was found that 0-0005 grm. of germanium 

 oxide could be readily detected when present with 0-1 

 grm. arsenious oxide. 



This reaction is also well adapted to the use of the 

 simplified form of apparatus described in our previous 

 paper. 



New Haven, Conn., July, 1918. 



