IV 
CONTENTS. 
Magnetism, 11. Dip of the Needle at London in 1821, 387 
II. CHEMISTRY. 
12. Nitrogen Springs in Rensselaer County, New York. 13. 
Analysis of Gibbsite, a New Mineral. 14. Cathartine, or 
the Active Principle of Senna. 15. Analysis of the Me- 
teoric Stone of Juvenas. l6. Soda-Alum. 1?. Melanie 
Acid in Black Urine. 18. Conversion of Iron into Plum- 
bago, - - - - 387-391 
III. NATURAL HISTORY. 
Mineralogy. I9. The Secondary or Floetz Formations, as de- 
termined by Werner, the same in Great Britain as in Ger- 
many. 20. Sulphate of Lead. 21. Hyperstene. 22. Plum- 
bago from North Carolina. 23. Rose Quartz of Southbury, 
Connecticut, : - - - 391-394 
Botany. 24. Dr Hooker's Exotic Flora. 25. Mr Greville’s 
Cryptogamia of Scotland, - - 394-396 
Zoology. 26. Dr Fleming’s Zoology. 27. Notice regarding 
the History and Distribution of the genus Psittacus or 
Parrot. 28. Luminous property of the Ocean, as derived 
from Insects, . - - 398-402 
IV, general science. 
29. Blowing Sand. 3p. Account of the Stupendous Cavern of 
Watertown. 31. Explosion of the Boiler of a Steam-En- 
gine at Chester. 32. Copper raised in Great Britain during 
the y^ar ending SOth June 1 822, - 401-406 
Art. XXXL List of Patents granted in Scotland, from 13th 
April to 29th August, 1822, - 406 
Index, 
^ 409 
