224 Proceedings of Royal Society of Edinburgh, [may 16 , 
possible that any appreciable rise of temperature could occur, the 
mass of liquid being very large. 
Experiments. 
In the first series of experiments no additional resistance was 
placed in the circuit when the plates had been heated. The results 
obtained are shown graphically in Plate VII. The series of points 
marked a give the results when the plates were newly heated. 
Those marked b give the results when the plates had been left in 
the liquid for half an hour after heating and performing the experi- 
ments corresponding to a. Those marked c were obtained after the 
plates were left in the liquid for a number of hours — about twenty, 
more or less. A Tray-Daniell cell was used so as to give constant 
electromotive force. Half a minute was allowed to elapse before 
taking the first reading. 
Experiment la. — Plates heated. 
Deflection at intervals of 10 secs. — 92, 82, 75, 69, 66, 64, 59, 56, 
53, 50, 49, 47, 46, 44, 43, 42, 40, 39, 38, 37, 36, 35, 35, 
34, 34, 33. 
At intervals of J min. — 32, 32, 32, 31, 30, 29, 29, 28, 28, 28. 
At intervals of J min. — 27, 27, 26, 25, 24, 24, 23. 
At intervals of 1 min. — 22, 21, 20, 19, 19, 18. 
Experiment lb. — Plates connected by a copper wire for 30 min. 
10 secs, interval. — 83, 70, 65, 60, 56, 53, 50, 48, 46, 45, 43, 
42, 41, 40, 39, 38, 37, 37, 36. 
J min. interval. — 35, 35, 34, 33, 32, 31, 30, 30, 29, 29. 
J min. interval. — 28, 27, 26, 25. 
1 min. interval.' — 24, 23, 21, 20, 20, 19. 
Experiment 2 a. — Plates heated. 
At intervals of 10 secs. — 93, 85, 76, 65, 63, 60, 57, 55, 52, 50, 
48, 47, 46, 45, 44, 43. 
J min. interval. — 40, 38, 37, 36, 35, 34, 33, 33, 32, 32. 
J min. interval. — 28, 27, 26, 25, 25, 24, 24, 24. 
1 min. interval.- — 22, 21, 21, 20, 20, 20. 
