432 
Proceedings of the Royal Society 
gether and at the positive end of the scale, while tin is nearly at 
the negative end of the scale. 
The results of Becquerel may be deduced from this scale, with 
the exception of the position of tin and of iron. He agrees in making 
antimony and bismuth positive to zinc. 
For the sake of comparison, I exhibit the electro-frictional series, 
deduced from this scale alongside of three other series which we 
should expect to have an intimate resemblance. 
Table Y. 
Electro-Frictional 
Series. 
Electro-Chemical 
Series, by 
Berzelius. 
Electro-Contact 
Series, by Hankel. 
Electro-Contact 
Series in Air, by 
Ayrton and 
Perry.* 
Gold. 
Antimony. 
Platinum. 
Platinum. 
Platinum. 
Gold. 
Silver. 
Copper. 
Tin. 
Platinum. 
Gold. 
Brass. 
Silver. 
Silver. 
Copper. 
Iron. 
Copper. 
Copper. 
Iron. 
Tin. 
Lead. 
Bismuth. 
Bismuth. 
Lead. 
Brass. 
Tin. 
Antimony. 
Zinc. 
Mckel. 
Lead. 
Lead. 
Iron. 
ISTickel. 
Tin. 
Aluminium. 
Iron. 
Zinc. 
Zinc. 
Magnesium. 
Antimony. 
Bismuth. 
Zinc. 
Aluminium. 
Magnesium. 
Aluminium. 
It will be observed that the principal diversity consists in the 
positions of antimony, bismuth, and tin — all metals of the antimony 
group. As regards crystalline form, tin differs from the other 
metals comprised in the electro- frictional series; it belongs to the 
quadratic system. Silver, gold, copper, iron, lead, which are found 
together in the series, belong to the regular system of crystals ; while 
antimony, bismuth, zinc, magnesium, which ai’e also found together, 
belong to the rhombic system. The last four metals also agreed 
in exhibiting the greatest tendency to be positive at first. 
BUSINESS. 
Dr Francis T. Bond was balloted for, and declared duly elected 
a Fellow of the Society. 
Trans. Roy. Soc., vol, clxxi, p. 34. 
