CONTENTS. 



ART. PACK 



Eritrogene, and the colouring Matter of the Blood. 28. Compounds 

 of Cystic Oxide. 29. On Prussian Blue in Urine. 30. Excrement 

 of the Boa Constrictor, Urate of Ammonia. 31. Prize Questions. . 156 



III. Natural History. 



1. Extraordinary Formation of Hornstone. 2. Matrix of the Brazi- 

 lian Diamond. 3. Native Carbonate of Soda in India. 4. Acid Earth 

 of Persia. 5. New Experiment with Hydrogen. 6. Organic Remains in 

 Poland. 7. Charcoal in the Cinders of Vesimus. 8. Observations 

 made on Vesuvius audits Products. 9. Hot Springs at Jumnotri. 10. 

 Shock of an Earthquake at Sea. 1 1. Aerolite at Coddenham, in Suf- 

 folk. 12. Direction of Lightning. 13. Observations on the Boletus 

 Igniarius. 14. On the employment of Electricity in the treatment of 

 Calculus Cases. 15. Dumbness cured by Electricity. 



1. The Greenwich Rural Circle 199 



2. Mr. Groombridge's Transit Circle ib. 



XIII. Meteorological Journal 190 



Professor Brande's Lectures on Chemistry 191 



