CONTENTS 
1 
e:xiK 
Y' 
Of" 
No. I. 
Art. 1. Oft a New Optical and Mineralogical Structure exhibit- 
ed in certain specimens of Apophyllite and other mi- 
nerals. By David Brewster, LL. D, F. R. S. &c. 1 
II. On the Hyposulphurous Acid and its Compounds. By 
J, F. W. Herschel, Esq. F. R. S. &c. - 8 
III. Application of the Indeterminate Analysis to the elimi- 
nation of the unknown quantities from two Equations. 
By William Wallace, Esq. F. R. S. Edin. - 29 
IV. Description of a New Hygrometer, made of the internal 
membrane of the Arundo Phragmites. By Alexander 
Adie, F. R. S. Edin. - - - 32 
V. Account of an Excursion to Thebes, and of the Anti- 
quities recently discovered in that City, In a Letter 
from a Scotch Gentleman in Cairo, - 33 
VI. Experiments on the Structure and Refractive Power of 
the Coats and Humours of the Human Eye. By Da- 
vid Brewster, LL. D. F. R. S. Lond. & Edin. and 
the late John Gordon, M. D. F. R. S. Edin. - 42 
VII. Demonstration of a Theorem relating to Prime Numbers. 
By Charles Babbage, Esq. F. R. S. &c. - 46 
VIII. Description of the Diamond Mine of Panna. By Fran- 
cis Hamilton, M.D. F.R.S. & F.A.S. Lond. & Edin. 49 
lx. Description of the Patent Sympiesometer or New Air 
Barometer. By Alexander Adie, F. R. S. Edin. 54 
X. Method of Weighing Anchors, used by the Natives of 
the Coast of Coromandel, - - 60 
XL Examination of some Compounds which depend upon 
very weak Affinities. By Jacob Berzelius, M. D. 
F.R.S. and corresponding Member of the Institute 
of France, - - - 63 
XII. Comparison between the length of the Seconds Pen- 
dulum, as determined by Mr Whitehurst and Captain 
Kater. By Edward Troughton, Esq. F. R. S. 75 
