iv CONTENTS. 



Page 



35. On a peculiar Property of Alloys (F. Rudberg) . 404 



36. On the Combination of Chloride of Gold with the Chloride of Potassium 



and Sodium (Berzelius) ... 409 



37. On Magnesium (Justus Liebig) * . . .411 



38. On the Expansion of Bismuth and its Alloys during Congelation (Pro- 



fessor Marx, of Brunswick) . . ibid. 



$ III. NATURAL HISTORY. 



1. Formation of Hail ... 415 



2. Georgia Meteor and Aerolite ... . ibid. 



3. On the Thermal Waters of Chaudes Aigues, in the Department du 



Cantal (M. Chevalier) . . . . . 417 



4. Humboldt's Account of the Gold and Platina District of Russia . 418 



5. Parrot's Expedition to Ararat . . . . . 419 



6. Cuticular Pores of Plants ..... ibid. 



7. Smut in Corn . * .... 420 



8. Structure of Leaves . . . . 421 



9. Crystals of Oxalate of Lime in Plants . . . . 422 



10. Growth of Vegetables . . . . . ibid. 



11. On Circulation in Vegetables . ... 424 



12. New Method of multiplying Dahlias .... ibid. 



13. Seat of the Sense of Taste ..... 425 



14. Remarkable Case of the Reunion of a divided Part . . ibid. 



15. Singular Effect of Opium . . . .426 



16. Mechanical Powers of a Spider . . . ibid. 



17. White Bait . . . . . ibid. 



18. To restore the Elasticity of a damaged Feather . . . 427 



19. Ornithology ..... ibid. 



20. Ichthyology . . . .429 



21 . Influence of the Aurora Borealis on the Magnetic Needle (A. T. Kupffer, 



of St. Petersburg) ..... ibid. 



22. Description of some Atmospheric Phenomena (Prof. Strehlke, of Danzig) 432 



23. On the Produce of Gold and Silver in the Russian Empire (Alex, von 



Humboldt) ...... 434 



24. On the Change which the Air in Eggs undergoes during Incubation 



(Professor Dulk, of Konigsberg) . . . 435 



