ATOMIC WEIGHT OF SILICON. 



261 



After the material had been collected in bulb A, a considerable amount 

 of mercury was added and, with the bulb and contents nearly at 100°, 

 the bulb was exhausted through a drying tube by a very efficient water 

 pump. The liquid boiled vigorously so that a large part of the excess 



6 



6 

 6 



6 

 0" 



6 



6 



H 



Si Br. 



OOO 



(1)0(3)0 



h 



0050 



000 



0000 



K 



Figure 6. 



of bromine evaporated, together with tetrabromide vapor. The air 

 must have been thoroughly flushed out by this boiling. Probably a 

 large portion of hydrobromic acid formed by hydrolysis was removed 

 at the same time. The bulb A was sealed off while the pump was 

 operating. Upon shaking the bulb A, after cooling, the mercury 



