Manchester Memoirs, Vol. XL VIII. 



Plate IX. 



The Committees Electrolytic Method. 



Fig. I shews the influence of 2 c.c. of amyl alcohol and of invert sugar on 

 the production of arsenic mirrors, when using 50 c.c. of a solution containing 

 i-Juth grain per gallon. "With " means with amyl alcohol, and "without" 

 means without amyl alcohol. The figures underneath give in igrammes the 

 quantities of invert sugar added to the apparatus. The ordinary method 

 being employed. 



5 amperes without 

 cooling. 



blank with- with with without amyl alcohol and 

 out 

 amyl aico- ^ — 10 5 — 10 grammes invert sugar. 



%\ I ' 



hoi 



Fis:. 1. 



Fig. 2 shews the influence of 2 c.c. of amyl alcohol and of alcohol and 

 glucose together on the production of arsenic mirrors, when using 50 c.c. of 

 a solution containing x-g-trth grain per gallon. "With" underneath means 

 with amyl alcohol, "without" means without amyl alcohol. The figures 

 underneath give in grammes the quantities of glucose added to the apparatus. 

 The tubes were cooled at the points where the mirrors were produced. 



« 1 



3 amperes with 

 cooling. 



blank with- with with amyl alcohol and 

 out 

 amyl alco- i 2 5 lo 20 grammes glucose. 



Fig. 2. 



