4 DE. EDWAED C. EDGAE ON THE ATOMIC WEIGHT OF CHLOEINE. 



The bulb contained over 600 grammes of palladium, in which about 2% grammes 

 of hydrogen were stored in each experiment. 



Fig. 1. 



To Messrs. Johnson and Matthey my thanks are due for lending me 400 grammes 

 of palladium. 



3. Preparation of Chlorine. The details of the preparation of chlorine by electro- 

 lysing fused silver chloride are given fully on pp. 177-180 of DIXON and EDGAR'S 

 paper.* The only alteration I made in these experiments was to substitute boro-silicate 

 glass for soft glass as the material for the various connecting tubes. 



As before, the purity of the gas was shown by its complete absorption by pure, 

 dry mercury. 



4. The Chlorine JBirfb. The bulb, in which chlorine was condensed as a solid by 

 liquid air, was made of boro-silicate glass ; a sketch of the apparatus is given in fig. 2. 



Fig. 2. 



The only difference to be noted between the apparatus I used and that described in 

 the former paper is that mine terminated in a quartz jet F connected by a ground 

 joint with the delivery tube. 



The " reversed " tap (e, fig. 2) had proved so trustworthy in controlling the exit of 



* 'Phil. Trans.,' 1906, vol. 205, p. 177. 



