CONTENTS. ijj 



ART. 



PAGE 



ii. Catalogue of the Orbits of all the Comets hitherto computed. By 

 Dr. Olbers and Professor Schumacher , # 34,3 



iii. Report to the Board of Customs, containing a description of an 

 improved Sliding Rule for guaging Casks. By Dr. Young : . . 357 



iv. Remarks on Professor Struve's Observations to determine the 

 Parallax of the fixed Stars. By John Pond, Esq., Astr. Roy. . . 3G4 



v. Account of some Parhelia seen at the Cape of Good Hope. By 

 the Rev Fearon Fallows, A. M . . 365 



Xrlll. Miscellaneous Intelligence. 



I. Mechanical Science. 



1. Experiments on the tenacity of Iron Wire, by Col. Dufour. 

 2. Suspension Bridge of Iron Wire at Geneva. 3. Hydraulic Experi- 

 ments on the Propagation of Waves, by M. Ridine, of Zuric. 4. On 

 a phenomenon of Shadows, by % M. Monyez. 5. On the Vibration of 



Air „ _ 



3G7 



II. Chemical Science. 



1. Thermo-Electric Rotation, by Prof. Cumming. 2. Thermo- 

 Electric Rotation. 3. Thermo-Electric Phenomena with Iron. 4. 

 Dobereiners Eudiometer. 5. On the Action of Platina on mixtures 

 of Oxygen, hydrogen, and other Gases. 6. Solar Light and Heat. 7. 

 Benzoic acid in the ripe fruit of the Clove-tree. 8. Certainty of Che- 

 mical Analysis. 9. Correction of bulk of Gases for Temperature. 10. 

 Supports for ignition of Particles by the Blowpipe. ] 1. Solubility 

 of Substances induced by Tartaric Acid. 12. On two new coloured 

 test Papers. 13. On the presence of ammonia in rust of Iron found 

 in inhabited Houses. 14. New Carburetted hydrogen Gas. 15. On 

 Titanium, by M. Rose. 1G. Cadmium from Zinc-Works. 17. Alloy 

 of Zinc and Iron. IS. Muriates of Baryta, Strontia, and Lime. 

 19. On a Quadruple Salt. 20. Pyrophorus from Tartrate of Lead. 21. 

 On a green Pigment. 22. Peculiar effects of Burning on Limestone 



or Chalk. 23. New vegetable principle ; Dalhinc 372 



b2 



