132 Analyses of Books. (Fes. 
appears to have been made with great care, and with sufficient pre- 
cision. He rated the quantity of hydrogen too high, because he 
was ignorant of the true nature of cyanodide of mercury. When 
his numbers are corrected, by attending to the true nature of that 
body, his results will come sufficiently near those of Gay-Lussac. 
The sulphureted and ferrureted chyazic acids appear to be distinct 
substances, and probably Mr. Porrett’s views of their constitution 
are correct. It is obvious that Gay-Lussac formed sulphureted 
chyazic acid by mixing together cyanogen and sulphureted hydrogen, 
though he himself was not aware of what he had done. 
6. On the Nature and Combination of a newly discovered Vege- 
table Acid, with Observations on Malic Acid, and Suggestions on 
the State in which Acids may have previously ewisted in Vegetables. 
By M. Donovan, Esq.—(See Annals of Philosophy, vol. vii. 
p- 37.) 
7. On the Structure of the Organs of Respiration in Animals 
which appear to hold an intermediate Place between those of the 
Class Pisces and the Class Vermes, and in two Genera of the last- 
mentioned Class. By Sir Everard Home, Bart. V.P.R.S.—(See 
Annals of Philosophy, vol. vii. p. 69.) 
8. On the Mode of Generation of the Lamprey and Myxine. 
By Sir Everard Home, Bart. V.P.R.S.—(See Annals of Philosophy, 
vol. vii. p. 69.) 
9. On the Multiplication of Images, and the Colours which ac- 
company them, in some Specimens of Calcareous Spar. By David 
Brewster, LL.D. F.R.S. L. and E.—(See Annals of Philosophy, 
vol. vii. p. 8.) 
10. A Series of Observations of the Satellites of the Georgian 
Planet, including a Passage through the Node of their Orbits ; 
with an introductory Account of the telescopic Apparatus that has 
been used on this Occasion, and a, final Exposition of some calculated 
Particulars deduced from the Observations. By Wm. Herschel, 
LL.D. F.R.S.—(See Annals of Philosophy, vol. vii. p. 2.) 
11. An Account of some Experiments with a large Voltaic Bat- 
tery. By I. G. Children, Esq. F.R.S.—(See Annals of Philo- 
sophy, vol. vii, p. 11.) [noticed a mistake in one of the experi- 
ments as related in Mr. Children’s paper. I have since received a 
letter from that Gentleman, in which he has had the goodness to 
give me the correction of the error, which had crept in during the 
hurry of transcribing. The diameter of the platinum wire, of 
which eight feet six inches were fused, ought to have been stated, 
not 0°44 inch, but 0°044 inch. ; 
12. On the Dispersive Power of the Atmosphere, and its Effect 
on Astronomical Observations. By Stephen Lee, Clerk and Libra- 
rian to the Royal Society—(See Annals of Philosophy, vol. vii. 
2) 
y 13. Determination of the North Polar Distances and proper 
Motion of Thirty Fixed Stars. By John Pond, Esq. Astronomer 
Royal, F.R.S.—(See Annals of Philosophy, vol, vii. p. 2.) 
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