CONTENTS. 
m 
Art. XXVITI. Observations on the difference of the Shell of In- 
dividuals of different Sexes in the Cephalated 
Mollusca. By M. De Blainville, - 859 
XXIX. Reply to Mr Brooke’s Observations on the Con- 
nexion between the Optical Structure of Mi- 
nerals and their Primitive Forms. By David 
Brewster, LL. D. F. R. S. Lond. & Sec. R. S. 
Edin. - 361 
XXX. General View of the Geognostical Structure of 
the Country extending from Hudson’s Bay to 
the Shores of the Polar Sea. By John Ri- 
chardson, M. D. M. W. S., &e. - 872 
XXXI. On the Anatomy of the Ornithorynchus Paradoxus 
of New South Wales. By Dr Knox, - 377 
XXXII. Abstract of Mr Faraday’s Experiments on the 
Condensation of several Gases into Liquids, 381 
XXXIII. Analysis of a Black Mineral from Candy, in 
Ceylon, named Candite. By Dr C. G. Gmelin 
of Tubingen, - - - 38 4* 
XXXIV. Celestial Phenomena, from October 1. 1823 to 
January 1. 1824, calculated for the Meridian 
of Edinburgh, Mean Time, with Observations 
on the Lunar Eclipse of the 23d of July. By 
Mr George Innes, Aberdeen, - 387 
XXXV. Proceedings of the Wernerian Natural History 
Society. (Continued from p. 188.) - 389 
XXXVI. Scientific Intelligence, - - 391 
I. natural philosophy.* 
Astronomy. 1. History of the Rediscovery of Encke’s Comet. 
2. Longitude and Latitude of Paramatta. 3. New Ele- 
ments of Encke’s Comet. 4. Observatory of Dorpat in Li- 
vonia. 5. Measurement of a Degree in Livonia. 6. Eclipse 
of the Sun of 7th February 1823, observed at Bushy Heath. 
7. Rev. Dr Pearson’s Introduction to Practical Astronomy. 
8. Change in the Declinations of some of the Fixed Stars, 391-393 
Optics, g. Paranthine and Wernerite. 10. On the Defective 
Vision of the Horse, - 393 
Acoustics. 11. On the Polarisation of Sound. 12. On the 
Oscillations of Sonorous Chords, - - 394, 395 
Electricity. 13. Improvement on the Electrical Machine. 
14. On the Production of Electricity by Pressure. 15. De- 
velopment of Electricity by two pieces of the same Me- 
tal, - 395, 396 
