VI CONTENTS. 



Page. 

 XV. On the Coal Reg-ion, Topograj)hy, &,c. of part of the Al- 

 leghany Mountains ; by Samuel Wyllys Pomehoy, Esq. 342 

 XVI. On the Utility of iixing Lightning Conductors in Ships; 



by W. S. Harris, Esq. 347 



XVII. The Geological Age of Reptiles; by Gideon Mantell, 



Esq. F. R. S. &c. &c. 359 



MISCELLANIES FOREIGN AND DOMESTIC. 



CHEMISTRY. 



1. Manganese; mode of ascertaining the commercial value of 



its ores, - .._ 354 



2, 3. Iodine and bromine in mineral waters — Illumination of 



light houses, --.--_._ 36G 



4. Original decomposition of potash, - - - _ _ 357 



5, 6. Decomposition of water by atmospheric and by common 



electricity — On the state of chlorides, iodides, &c. in so- 

 lution, 368 



7, 8. Discolored chloride of silver — Whewell's written nomen- 



clature for chemical compounds, ----- 369 

 9, 10. Preservation of blood — Presence of manganese in the 



blood, 370 



11, 12. On the expansion of bismuth and its alloys during conge- 

 lation — Bismuth, tin and lead, 371 



13, 14, 15. Crystals of oxalate of lime in plants — To restore the 

 elasticity of a damaged feather — On the produce of gold 

 and silver in the Russian empire, - - . _ 372 



16. British association for the promotion of science, - - 373 



17, 18. Conducting powers of liquid gases — Power of carbon to 



destroy the bitterness of certain bodies, - . _ 374 

 19, 20. Combustion of an alloy of tin and lead — Vauquelin's pro- 

 cess for obtaining metallic chromium, - - - - 375 

 21. On the acidification of iodine by means of nitric acid, - 376 



mechanical philosophy. 



1. Influence of electricity in communicating phosphorescence 



and color, --------- 378 



2, 3. Difference in brilliancy of the primary and secondary rain- 



bow — On the discharge of a jet of water under water, 379 



4, 3. On the discharge of a jet of water in water — Clement's 



experiment, -------- 380 



6,7. An acoustic rainbow — Compression of fluids, - - 381 



8, 9. Proportion between the metre and English yard — Dip of 



the magnetic needle at St. Petersburgh, - - - 382 



NATURAL HISTORY. 



Od habits of cleanliness in birds, _ . . - - 382 



