[ 32 ] 
VI. Letter to R. Phillips, Zsq., F.R.SS. L. and E., on the 
subject of Professor Daniell’s last Communication. By 
W. R. Grove, Esg., M.A, F.R.S., Professor of Expe- 
rimental Philosophy in the London Institution. 
My bear Sir, 
HAD hesitated (for reasons with which I shall not trouble 
you) in replying to Professor Daniell’s last letter, but oncon- 
sideration I have determined to make a few comments upon it. 
It appears that the assertion of Professor Daniell, “that I 
had never spoken of my battery but as the further application 
of principles which he had previously deduced, ”proceeded 
from his supposing he had heard me at the London Institution 
‘admit, that it was in following up his train of reasoning I 
was led to the construction of my battery.” 
On the occasion mentioned I showed the gold leaf experi- 
ment; I have now in my laboratory the identical gold leaf, 
prepared by my then assistant, Mr. Styles; it is gummed on 
glass and the one half dissolved. 
I did in that lecture give Mr. Daniell all the credit I could 
for the invention of his battery, and avoided, as much as pos- 
sible, any allusion to points on which I differed from him. 
I thought then, and I think now, that I should have been 
uilty of singularly bad taste had I done otherwise; I then 
believed Mr. Daniell’s presence an act of courtesy, I felt grate- 
ful for it and so expressed myself; I frankly admit that I did 
pay him “a greater compliment than the occasion required :” 
I hope, if Professor Daniell or any other gentleman should feel 
anxious to publish, fifteen months after date, what I said at an 
extempore lecture, they will have the kindness first to ask me 
whether or not I was rightly understood. Although I cer- 
tainly did not think it necessary at my lecture to state pointedly 
wherein I differed from him, yet the tone of Professor Daniell’s 
letter obliges me now, in order to obviate further mistakes, to 
review some of the passages of his and my writings on this 
subject. 
Professor Daniell, Phil.Mag., 
Dec. 1842, p. 421. 
“,,..thenitricacid battery 
exactly resembles the constant 
Professor Daniell, Phil. Trans., 
1836, p. 119. 
“ Upon adding nitric acid 
to the solution of sulphate of 
battery in every particular ev- 
cept the substitution of plati- 
num and nitric acid for copper 
and sulphate of copper; and 
an experimentalist might, very 
obviously (!], have been led to 
copper, I found that an zyu- 
rious effect was produced; and 
that the mean quantity of gas 
in five minutes was lowered to 
1*1 cubic inch; at this rate of 
action, the battery, however, 
