vi CONTENTS. 
Pace. 
XIV. On Central Forces; by Prof. Tuzopore Strone, - 343 
XV. On the elevation required for rails on Rail Roads of a 
given curvature ; by J. Tomson, - - = 346 
MISCELLANIES——FOREIGN AND DOMESTIC. 
CHEMICAL AND MECHANICAL SCIENCE. 
1. Ilicine—a remedy in intermittent fevers,  - - - 349 
2, 3. Fertilizing property of Sulphate of Lime—Composition 
of Gum, - - - - - - - - 350 
4. Hydruret of Sulphur, ~ - 351 
5, 6. Chemical Agency of Light—Splendid combuntien of hy- 
drogen gas under strong compression, - - 352 
7. Protoxide of Copper, - - - - - ~ 353 
8, 9. Estimation of the bleaching power of chloride of lime— 
Inflammation of gunpowder under water, * - - 354 
10, 11. Cause of Goitre—Memoir on the transference of pon- 
derable substances by electricity, - - - - 355 
12. Stature of the Human Race, - - - ~ - 357 
13, 14. New Machine—Large achromatic Telescopes of M. 
Cauchoix, - - - - - - - - 358 
15, 16. Preservation of plants during winter by spring water— 
French premiums, - - - - - - 359 
17. Influence of heat on magnetism, - - - - 361 
18. New experiment in Mechanics, - - - - 362 
19, 20. Respiration of Plants—Cultivation of the material used 
in the fabrication of Leghorn hats, - - - 363 
21. Non-vaporization of a liquid falling in small quantity on an 
incandescent metal, - - - - - - - 365 
22, 23, 24. New method of producing perspiration in Cholera 
Morbus—New Compost—New size for the Chain of 
Woven Cloth, - - - - - - - 366 
25, 26. French Ultramarine—Singular case of odoriferous ema- 
nations, - - - - - - Sy ae ie 368 
27. Gelatine of Bones, - - - - - - - 369 
28. New instruments for measuring heat, - - - 370 
29. Advantages of Bored Wells in communicating heat, - 373 
30. Limits of the Audibility of Sound, - - - - 374 
31, 32. On the Sleep of Plants—Shower of Flies. Singular ap- 
pearance of the Moon, - - - - - - 375 
33. Improved Blowpipe, - - - = = = 376 
