112 Hare’s New Galvanic Apparatus, Theory, se: 
sion through the tube, replacing the oxide in its situatiou, 
should it be dispersed. If the charges are sufficiently pow- 
erful, a part of the tube will soon be stained with metallic tin 
which has been revived by the action of transmitted elec- 
tricity.”” It cannot be alleged that in such decompositions 
the divellent polar attractions are exercised like tho 
which characterize the action of wire proceeding from the 
poles of a voltaic apparatus. The particles were dispersed 
from, instead of being attracted to the wires, by which the 
influence was conveyed among them. This being undenia- 
ble, it can hardly be advanced that we are to have one mode 
f explaining the separation of the elements of brass by an 
electrical discharge, another of explaining the separation of 
the elements of water by the same agent. e rationale 
when oxygen is liberated from tin, and another when libe- 
rated by like means from hydrogen. In the experiment in 
which copper was precipitated by the same philosopher at 
the negative pole, we are not informed whether the oxygen 
and acid in union with it were attracted to the other; and 
he changes-produced in litmus are mentioned notas simul- 
taneous, but successive. The violet and red rays of the 
spectrum nae an opposite chemical influence in some de- 
gree like that of voltaic poles, but this has not led to. the 
conclusion that the cause of galvanism and light is the same. 
Besides, admitting that the feeble results obtained by Wol- 
laston and Van Marum are perfectly analogous to those ob- 
can 
ad hypothesis, it ought first to be shown that the union 
etween caloric and electricity, whi hown i 
extricated by ordinary galvanic action, they must have an 
affinity for each other. As I have suggested in my me- 
Proaching to those of a fluid in which caloric exists in great- 
eppPportion: agai 
But once more I demand why, if mechanical electricity 
be too intense to produce galvanic phenomena, should it be 
rendered more capable of producing them by being. still 
more concentrated. 
