IV 
CONTENTS. 
Electro-Magnetism* 1 9. Dr Seebeck’s Electro-Magnetic 
Experiment. 20. M. Erman’s Electro-Magnetic Apparatus, 399 
II. CHEMISTRY. 
21. A New Fluid, with remarkable Physical Properties, disco- 
vered in the Cavities of Minerals. 22. Pyro-citric Acid. 
23. Combination of Alcohol with Oil of Turpentine. 24. 
New Compound of Iodine, Hydrogen, and Carbon. 25. 
Hydro-carbo-sulphuric Acid, - - 400, 401 
III. NATURAL HISTORY. 
Mineralogy and Geology. 26. Cleaveland’s Mineralogy and 
Geology.. 27. Necker de Saussure’s Travels in Scotland. 
28. Formation of Calcareous-spar. 29- Neptunian Forma- 
tion of Calcedony. 30. Toad in a solid Rock. 31. Green 
Oxide of Zinc. 32. Discovery of Datolite in America. 33. 
Secondary Granite. 34. Rhinoceros' Horn found in Scot- 
land. 35. Turquoise of Persia, - - 402-404 
Botany. 36. Dr Hooker’s Flora Exotica. 37* Mr Greville’s 
Scottish Cryptogamic Flora, - - 405-407 
Zoology. 38. Notice regarding Skulls found in Germany, and 
Description of the Head of a Mummy. 39. Silk Worm. 
40. Supposed Written Characters on the Wing of the Lo- 
cust. 41. Economy of the Toad (Rana Bufo). 42. Spur 
of the Ornithorhynchus. 43. Hybernation of the Corn- 
crake, - 408-414 
IV, GENERAL SCIENCE. 
44. Colour of the Arabian Sea. 45. Schmidt on the Height of 
the Atmosphere. 46. Account of a Cavern of Lava in St 
Michael’s. 47- Lithographic Prizes to be adjudged by the 
Society of Arts for Scotland. 48. Wire Guage recommend- 
ed by the Society of Arts. 49. Dr Charles Anderson’s Ma- 
chine for measuring small quantities of Fluids, 415-41 8 
Art. XXIII. List of Patents granted in Scotland from 14th 
November 1822 to 6th March 1823, 
420 
