212 
MESSRS. W. DE LA RUE AND H. W. MULLER ON THE 
Tube 106, 23 '5 inches betiveen the two straight terminals composed of ivire 
about 0*25 inch thick, diameter 2 inches. 
Carbonic Acid and Bromine. 
205. — 4800 cells, C. 0'01840 W. A confused discharge throughout, as fig. 4, a, 
Plate 17. With 1,770,000 ohms the current reduced to 0-00238 W, when 
strata were produced, filling about half of tube as b in the same figure. 
These are copied from photographs obtained in 90 seconds and 4 minutes 
respectively. 
In illustration of the change in the number of strata produced by a variation in the 
current we give a few more examples besides those already mentioned. 
Tube 111 , 23 inches between the straight terminals, diameter 2 '25 inches. 
Cyanogen. 
206. — 4800 cells, C. 0*01272 W. Seven strata as shown in fig. 3, a, Plate 17, 
which is copied from a photograph obtained in 15 seconds. The intro- 
duction of 1,000,000 ohms reduced the current to 0-00383 W, and then 
ten strata were obtained, as shown in b of the same figure, from a photograph 
obtained in 60 seconds. 
Tube 105, 25 inches between the straight terminals, diameter 2 inches. 
Cyanogen. 
207. — 3600 cells, C. 0"00834 W. Ten strata were produced, as shown in fig. 7, a, 
Plate 17, copied from a photograph obtained in 20 seconds. The intro- 
duction of 700,000 ohms reduced the current to 0*00191 W, and then there 
were thirteen strata, as shown in b of the same figure, from a photograph 
obtained in oije minute. 
In both the foregoing cases, tubes 111 and 105, the strata increased in 
number with the decrease of current. 
Tube 124, 26 inches between the straight terminals, diameter 2 inches. 
Sulphurous Acid. 
208. — 3240 cells in connexion with the condenser, as shown in fig. 26, Part 1. 
At the full potential 29 strata were produced, as shown in fig. 4, Plate 18, 
copied from a photograph obtained in 12 seconds in the presence of their 
Excellencies Kuo Sung tao, Minister of China, and Lien Hsi-hung, Assistant- 
Minister, April 27th, 1877. On introducing 1,000,000 ohms, the number 
