^1 CONTENTS. 



Page. 

 XI. On a Substitute for Welther's Tube of Safety, with No- 

 tices of other subjects ; by E. Mitchell, Prof of Chem. 

 Min. &c. Univ. of N. Car. - . , 345 



XII. On a Portable Hygrometer ; by A. A. Hayes, - 351 



XIII. MineralogicalJourney in the northern parts of New Eng- 



land, by Charles Upham Shepard ; Assis. to the Prof. 



of Chem. and Min., and Lect, on Bot. in Yale College, 353 



XIV. Philosophical Transactions of the RoyaJ Society of Lon- 



don, for the year 1829, - - - 361 



XV. Chemical Observations and Experiments on Tobacco ; by 



C. C. CoNWELL, M. D. Phila. - - - 369 



SCIENTIFIC INTELLIGENCE. 



CHEMISTRY. 



1, 2. On the Setting of Plaster — Braconnot's Indelible Ink, 371 



3. The Diamond, ----- 372 



4. Of the influence of air on the crystallization of salts, 373 



5. Combination of Mercury with metallic wires, - 375 



6. 7. Colored Steel Plates — Chemical action of light, - 376 



8. A new Ether, . . . . _ 377 



9. Pure Milk, - - - - - - 378 



10. Discovery of a new metal named Thorium, - 381 



11, 12. Action of Potash on Organic Materials — Composition of 



the Atmosphere, . _ . _ 382 



13. Combinations and Crystallizations, effected by the action of 



weak electrical forces, . . - 383 



MEDICAL CHEMISTRY. 



1. Preparation of Morphia, without the use of Alcohol, - 384 



2, 3, 4, 5. Plumbagine, a new vegetable substance — Analysis of 



Ipecacuanha Branca, Root of the Viola Ipecacuanha — 

 Decomposition of Corrosive Sublimate by Vegetable 

 Bodies — Rosaic Acid in Human Urine, - 385 



NATURAL HISTORY. 



1. Natural History of the Mole, - - - 386 



2, 3. On the different Genera and Species confounded with Cin- 



chona — Influence of Chemical Solutions on Plants, 388 



MECHANICAL PHILOSOPHY. 



1. Resistance in Space to the Motion of Heavenly Bodies, 389 



2, 3. Brown's Active Molecules — Destruction of Vermin in 



ships, by steam, _ . _ _ 390 



4. Electricity of the Solar Rays, _ - _ 391 



5, 6. Leech Bites — Professor Hansteen, Terrestrial Magnetism, 392 



STATISTICS. 



1. Foundling Hospitals, .... 393 



2, 3. Progress of Mutual Instruction in Denmark — Educational 



Beneficence, ----- 394 



