THEORY OF GALVANISM. 
99 
in tlie following pages, the new liglit which Mr. Singer's appa- Exeitement of 
. . * . . • , . 1, , V I 'I iralvaiiic eli'C- 
ratus has thrown on this subject, I sliall iiave very iuile 'o aod ami 
for pointing out the error of all the theories ol the cxciteiuein p-i nenuMia ol 
' , ti f I li-elric 
of galvanic electricity, whicli are the oojeet ot Mi Heine's coiua,,!. 
paper. 
Mr. Singer Iiad not been inattentive to what I had published 
in your Journal concerning my new apparatus; tor he thus 
begins liis paper : “ Ttie renurkable pro;>er(y ot the electric 
coliunn invetited by Mr. l)e [.uc, rendered the construction 
of that instrument on an extensive scale a desirable object. 
Trials were previously made on the cllects of various combina- 
tions, to ascertain the most ellicient arrangement.” 
Though I was struck by the title of Mr. Singer’s |>a|H*r, on 
tlie eftect of twenty tliousiind zinc and silver plates, arranged 
■.ssan electric colninn, which expressed an i cre.a.se of the ap- 
I paratusmuch beyond my expectation, I was still more astonished 
I by the increase of the effect, so uuicb they exceeded what I 
t could have supposed of tlie mere increase of ilie number ot 
p.airs. This made me w ish to have a direct intercourse with 
Mr. Singer; and, h.iving obtained it, to my great satisfacliun, 
1 can now. Sir, explain to yon what, though the inventor of 
the instioment, I could not understand myself in reading his 
paper; because, in describing the effects of liis apparatus, he 
has not insisted on the particulars from which depend its asto- 
nishing power. And as the causes of that increase of power 
arc peculiarly impoitant in the electric science, they cannot 
but intjiest the more attentive part of your readers. 
1 he principal changes made by this di.stingnished experi- 
mental philosopher in tlie electric column are two, one of 
which only is mentioned in liis description, and of this I shall 
first speak : for which purpose I must return to the steps 
which led me to that apparatu.s, as I shall then better explain 
Mr. Singer's great improvement in that respect. 
The first of these step- is expressed at the end of my paper 
in your number for June, 1610, concerning the galvanic pile, 
from the experiments which 1 before related, I arrived to this 
conclusion — that the dectromotion in that instrument was pro- 
duced 
