66 haws of the Elementary Voltaic Battery. 



In both these sets of results there is evidently a nearer approach 

 to Dr. Ritchie's law, than in any of the former, on the same subject. 

 In the last set, the deviation is more marked than in the first. The 

 partial accordance with the law in the first set, is most probably at- 

 tributable to some accidental peculiarity in the condition of the plates, 

 perhaps induced by the previous exposure to the nitric acid. The 

 same results have never been obtained with new slips, or with any 

 of those which had been immersed in sulphuric acid. 



19. A fresh pair of plates, gave results which so far from agreeing 

 with our first set above, are in perfect accordance with ;our former 

 ones.— New slips. — Sulp. ac. sol. 1 to 66. — Intervals 3 minutes. 



1st. set. — 8 inch. 4 inch. 2 inch. 1 inch. 



1st. effect, +500° +400° +300° +150° 



V 160 103 77 56 



2' 128 103 76 65 



3' 126 103 75 64 



A' 126 102 75 64 



The plates were now slid down to 8 inches, without removing 

 them from the solution, and afterwards shd up to the succeeding sta- 

 ges. 



20. After an interval of 16 hours, the same series was repeated. 

 First, however, the plates were dipped to 4 inches, in order to com- 

 pare the deflection with that from 8 inches immersion, the first time 

 they were used. — (See 19, 1st. set.) The deflections were, 



4 inch. 

 1st. effect, - 500° 



1' ------ 92 



2' - .92 



3' .88 



4' 84 



5' 84 



After 4 minutes exposure to the air, the regular series was begun. 

 Intervals between the dips 4 minutes. 



