iv CONTENTS. 



Art. XXVII. Scientific Intelligence :- 



METEOROLOGY. 



1. New Theory of Polar Lights. 2. Probable cause of 

 the Diurnal Variation of Magnetic Variation. 3. 

 Dr Faraday on the Diunial IMovements of the Mag- 

 . netic Needle. 4. On a Cloud of Dust which ob- 

 scured the Sun for two days in Russia, on the 29th 

 and 30th April 1840, during a clear sky and quiet 

 weather. 5. Shower of Aerolites. 6. Destruction 

 of Forests in ]\Iadeira. 7. Supposed change of 

 climate in New Zealand, . . . . 179 



GEOLOGY. 



8. On the Results of the latest Researches explanatory 



of Carbonic Acid Exhalations. By G. Bischoff, 182 



ZOOLOGY. 



9. On the Increase of the Nails and the Hair in Man. 



10. Protection against Musquitoes. 11. American 

 Zoological Journal. 12. External Symptoms of 

 Starvation, as observed in the Famine Districts in 

 Ireland, 183 



ARTS. 



13. Detonating Sugar. 14. x\n Ancient Art re-discovered, 185 



XXVIII. New Publications : — 



1. An Introduction to Conchology, or Elements of the 



Natural History of jMoHuscous Animals. Illustra- 

 ted with one hundred and twelve woodcuts. By 

 George Johnston, M.D., LL.D. 



2. The Principles of Geology Explained, and viewed 



in their relations to Revealed and Natural Religion. 

 By the Rev. David King, LL.D. 



3. The Atlas of Physical Geography — Constructed by 



Augustus Petermann, F.R.G.S. 



4. A Sketch of the Physical Structure of Australia, so 



far as it is at present known, with two Geological 

 Maps. By J. Beete Jukes, M.A., F.G.S., late 

 Naturalist of H.M.S. Fly. 



5. An Introduction to the Atomic Theory. By Charles 



Daubeny, M.D., F.R.S.L. 



6. Geognostische Briefe aus den Alpen. Von Bernard 



COTTA. 



7. Graptolites de Boheme, par Joachim Barrande, 186—187 



XXIX. List of Patents granted for Scotland from 16th 



September to 26th December 1850, . 188-192 



