it CONTENTS. 
Arr. PAGE 
XI, Astronomican ann Nautica, Conuectrions, No. XVII. 
i. Remarks on the Catalogue of the Orbits of the Comets that have 
been hitherto computed. By Dr. Ovpers . . . . . . . . + 85 
“iil. Further remarks on the periodical Comets, (86 Olb.) with con- 
jectures on the effect of a resisting medium. By Professor ENCkR 96 
iii. Comparison of the New Tables of Refraction, with observation 100 
iy. Note on Refraction, addressed to Professor ScHumMACHER . . 103 
- General Results of Observations on the Dipping Needle. By 
wv. Scopessyy Juni Baqi). swans dl anes Doth 2 wilfay 104 
vi. Elements of the Comet of 1823-4, By various Computers . . 104 
Xi. © © ° © AwALYsts oF ScrentiFic Books. 
i. Sur les Ichthyolites ou Poissons Fossiles. Par M. Blainyille, 
Article extrait.du. Noveau Dictionnaire d'Histoire Naturelle . . ~» 105 
ii. Philosophical Transactions of the Royal Society of London, for 
the Year 2gBP'82< IORI AES GW PEAY IORONY Wer wg lye ( 182 
iii, Letter to the Editor from Dr. William Henry . . . . © . 131 
XIII. Progress or Foreign ScieNcR . . « 6 we ow o + 135 
XIV: MISCELLANEOUS INTELLIGENCE. 
I, MgcHaANIcaL SciENCE. 
1, Remarks on Tron-Wire Suspension Bridges. 2. Test for the 
Action of Frost on Building Materials, by M. P. Brard. 3. On the 
strength of Cast Iron, and other Metals. 4. On the Capillary Action 
of Fissures, &c. 5. Sound produced by opening a Subterraneous 
147 
Gallery. 6. Nautical Bye-tube, 7. Leghorn Straw Plait 2... 
If. CaraicaL Science. 
1. On Fulminating Silver and Mercury. 2. On the unequal Dila~ 
tation of a Crystal in different directions, by heat, 3. Difference 
