MERCURY. 



169 



For the bromide Hardin's data are 



Weight HgBr v 

 .70002 



57*42 



.77285 



.80930 



.85342 



1.11076 



i 17270 



1.26186 



1.40142 



And for the cyanide 



Weight HgC 2 N 2 . 



.55776 



.63290 



.70652 



.80241 



.65706 



.81678 

 1.07628 

 1.22615 

 1.66225 

 2.11170 



Weight Hg. 

 .38892 

 .3135 

 .3i75 

 .42932 

 .44955 

 .47416 

 .61708 

 .65145 

 .70107 

 .77870 



Weight Hg. 



.44252 

 .50215 



.56053 

 .63663 

 .52130 

 .64805 

 .85392 

 .97282 



1.31880 



1.67541 



Per cent. Hg. 



55-558 

 55-555 

 55-563 

 55-550 

 55.548 

 55-56o 

 55-555 

 55-55 1 

 55-559 

 55-565 



Mean, 55.556, .0012 



Per cent. Hg. 



79-337 

 79-341 

 79-337 

 79-340 

 79-338 

 79-342 

 79-340 

 79-339 

 79-338 

 79-339 



Mean, 79.339, .0004 



In the last series cited no potassium cyanide was used, but the solution 

 of mercuric cyanide, with the addition of one drop of sulphuric acid, 

 was electrolyzed directly. 



The direct ratio between silver and mercury was determined by throw- 

 ing down the two metals, simultaneously, in the same electric current. 

 Both metals were taken in double cyanide solution. With Hardin's 

 equivalent weights I give a third column, showing the quantity of mer- 

 cury corresponding to 100 parts of silver. Many experiments were re- 

 jected, and only the following seven are published by the author : 



Weight Hg. 



.06126 

 .06190 

 .07814 

 .10361 

 .15201 

 .26806 

 .82808 



Weight Ag. 

 .06610 

 .06680 

 .08432 

 .11181 

 . 1 6402 

 .28940 

 .89388 



Ratio. 

 92.678 

 92.665 

 92.671 

 92.666 

 92.678 

 92.626 

 92.639 



Mean, 92.660, .0051 



