OF THALLIUM, INDIUM, AND TIN 



II 



like tube of B was immediately sealed with wax to protect it from air. 

 The pipettes were kept in a rack, shown in fig. 2. 



Precisely the same mode of procedure was followed in preparing and 

 protecting the electrolyte used in the cell. The stream of hydrogen was 

 allowed to bubble through C for some time to remove the last traces of air 

 from the solution. It was then drawn up into the pipette and sealed off 

 as before. When the solution was wanted its weight was, of course, not 

 sufficient to draw it out; accordingly the following method was used to 

 follow it up with hydrogen : A clean rubber tube, delivering a stream of 

 pure hydrogen, was slipped over the drawn-out portion, and the tube was 

 then broken ; in opening the stopcock, the solution readily flowed out. 



Fig. 2. Rack with Pipettes containing Amalgams. 



The amalgams of indium and tin were prepared in the same apparatus. 

 It was found more convenient to prepare the latter amalgams by adding 

 the metals directly to the mercury in the atmosphere of carbon dioxide in 

 the flask H, for they are far less readily oxidized than the others ; but 

 afterwards the amalgam was treated just as the others. 



