IV 
CONTENTS. 
Hydrodynamics. 15. Compression of Watei*. 16. New 
Eetaining Syphon, - - - 204 
Electricity. 17. Pyro-electricity of the Tourmaline. 18. 
Pyro-electricity of Nadelstein. I9. Electrical Fish, 205 
Magnetism. 20. Magnetic Qualities of Mica. 21. Variation 
of the Needle at Stockholm and at Drontheim. 22. Diurnal 
Variation of the Needle. 23. Magnetic Observations made 
during the Arctic Expedition, - - 206 — ^208 
II. chemistry, - - 208 — 210 
24. Thenard’s Experiments on Oxygenated Water. 25. Hy- 
posulphuric Acid. 26. New Acid in the Viburnum opu- 
lus. 27- Purpuric Acid. 28. Production of Light by break- 
ing Glass-balls filled with Oxygen. 29. Dulong and Petit’s 
new Experiments on Heat. 30. New Vegetable Alkali, 
called Strychnine. 
HI. NATURAL HISTORY, - - 21 J 
Mineralogy. 31 . Mineralogy of the Appennines. 32. Mine- 
ralogical Society of Dresden. 33. New Systems of Crys- 
tallography. 34. and 35. New Mineralogical Works. 36. 
Submarine Volcano near Shetland, - - 211, 212 
Zoology. 37- Ancient Greek Skull. 38. and 39. On the 
Human Skin> and Colour of Man. 40. Experiments on the 
Submersion of Frogs. 41. Live Lizard in a seam of Coal, 213 
Botany. 42. Amici’s Discoveries respecting the Motion of 
Sap in Vegetables, - - - 214 
IV. GENERAL SCIENCE, - 215 
43. Expedition overland from Hudson’s Bay to the Shores of 
the Arctic Ocean. 44. Whirlpools and subterraneous pas- 
sage of the Congo. 45. Whiteness and luminosity ‘of the 
Sea. 46. Preservation of Fruits by Carbonic Acid. 47. 
Black Emetic Root. 48. Scientific Travellers in Brazil. 
V. PRIZE QUESTIONS AND MEDALS. - 218 
49. Adjudication of the Copley Medal. 50. Rumford Medals. 
51. Establishment of a Physiological Prize in France. 
52. New Fund for Prize Medals in Scotland. 
Art. XXXVI it. Patents granted for Scotland in 181 9^ 
219 
