370 Mr. G. Gore. Effects of different Positive Metals [June 21, 

 Table III— Al + Pt + HC1 in 465 grains of Water at 16'5° C. 



Grrains. 



Yolts. 



Grrains. 



Yolts. 



0*15 

 0-13563 



0*9003 

 0-866 



-06078 

 -04581 



0*8431 

 0-8288 



-12066 

 0- 10569 

 0-09072 

 07575 



8517 

 -8345 

 0-8431 . 

 0-8517 



-0384 

 -03084 

 water 



823 

 0-8145 



» 



With the astatic galvanometer, the minimum proportion of acid 

 required to change the potential lay between 1 part in 12,109 and 

 15,000 parts of water; but with the reflecting one it was between 

 1 in 42,568 and 46,500. The curve of variation of electromotive 

 force, by uniform change of strength of liquid, was less regular than 

 with either zinc or magnesium, but presented certain points of simi- 

 larity with the curves of zinc, magnesium, and cadmium. 



The following table shows the proportions of the acid required to 

 upset the balance of each of the preceding couples in water : — 



Table IV. 



With the Astatic Gralvanometer. 

 Zn + Pt. Between 1 in 9,300,000 and 9,388,185 



Cd + Pt. 



)> 1 V) 



574,000 „ 



637,000 



Mg + Pt. 



?? 1 5) 



516,666 „ 



574,000 



Al + Pt. 



5J 1 >5 



12,109 „ 



15,000 



With the Eeflecting Galvanometer. 

 Zn + Pt. Between 1 in 15,500,000 and 23,250,000 

 Cd + Pt. „ 1 „ 1,162,500 „ 1,550,000 

 Mg + Pt. „ 1 „ 775,000 „ 930,000 

 Al + Pt. „ 1 „ 42,568 „ 46,500 



Table V.— Mg + Pt + Iodine in 465 grains of Water at 14° C. 



Grrains. 



Yolts. 



Grrains. 



Yolts. 



0-132 



0-119 



0-1062 



-0933 



0-0804 



0-0675 



1-5313 rose to 1* 777 



>> 5> » 



1-5112 „ 



i^74i ;; 



1*4598 „ 



0-0546 

 -0417 

 -0288 

 -0159 

 0-003 



1*4541 rose to 1*777 

 1*522 

 1*5588 

 » 



