47 Prof. Faraday on a supposed new 
6 
® P2% . 
a ey - P; sin@ (Q;—R,) dd does not vanish, since 
all the other terms do vanish by the nature of Laplace’s Co- 
efficients. 
Again, (Qo— Ro) + (Q)—Ri)+ «-- +(Q:—R,) +. =O. 
Multiply by P; sin 4 and integrate ; then we have 
Mees (Q; — R,) P; sinddidy = 0: 
but we showed that this does not vanish if Q; and R, are 
different functions. Hence that hypothesis is not true, and 
therefore Q; = R, and the expansions of f (6, )) are identical. 
Caius College, Cambridge, Feb. 18, 1836. 
LXXXI. Ona supposed new Sulphate and Oxide of Antimony. 
By Micwaer Farapay, D.C.L., F.R.S., §c. §c. 
To the Editors of the Philosophical Magazine and Journal. 
GENTLEMEN, 
| my Experimental Researches, paragraphs 693. 694. 695. 
696.*, have, in relation to antimony, described what I con- 
sidered to be a new sulphuret, and expressed my belief that a 
new and true protoxide existed consisting of single proportions, 
“but could not stop to ascertain this matter strictly by ana- 
lysis.” Professor Rose when in London informed me that Ber- 
zelius objected to my new sulphuret, and I was induced to make 
more accurate experiments on that point, which showed me 
my error, and accorded generally with what Rose had described 
to me. I intended to publish these results in the first electric 
paper which I might have to put forth; but my friend Mr. 
Solly has put into my hands a translation of Berzelius’s paper, 
and it is so clear and accurate as to the facts that 1 now pre- 
fer asking you to publish it, adding merely that my experi- 
ments quite agree with those described in it, as regards the 
sulphuret. With respect to the supposed chloride and oxide, 
I have not anywhere implied that I had made quantitative ex- 
periments on them. 
On Faraday’s supposed Sulphuret of Antimony and Oxide of 
Antimony : by J. J. BErzELivs.—From his “Jahresbericht,” 
No. 15. 
‘«‘ Faraday has stated, that when sulphuret of antimony is 
beated with more metallic antimony, a new sulphuret of anti- 
mony is formed, which when in the fused state is distinguish- 
* See Lond. and Edinb. Phil. Mag., vol. v. p. 170.—Enprr. 
