vi : CONTENTS. 
Page. 
XIV. On Central Forces; by Prof. Tuzopore Strona, - 343 
XV. On the elevation required for rails on Rail Roads of a 
346 
given curvature ; by J. Tuomson, i z 
MISCELLANIES——-FOREIGN AND DOMESTIC. 
CHEMICAL AND MECHANICAL SCIENCE. 
1. Iicine—a remedy in intermittent fevers, - 3 
2, 3: Fertilizing eorerty of Bulphate. of Lime—Compoiton 
of Gu 350 
4. Hydruret of sani 351 
5,6. Chemical Agency of Light—Splendid célisbuakien of JE 
drogen gas under strong ee, 352 
7. Protoxide of Copper - 353 
8, 9. Estimation of the bleaching power of chloride of imo 
nflammation of gunpowder under water. 354 
10, 11. Cause of Goitre—Memoir on the Gennaticenes of F — 
derable substances by oe - 355 
12. Stature of the Human Race, 3. 
13, 14. New —_— echromatic ‘Telescopes of ae 
Cauchoix, 358 
15, 16. Preservation of sists during | winter pwd spring water— 
French premiums, 359 
17. Influence of heat on magnetism, Ae ee + S61 
18. New experiment in Mechanics 362 
19, 20. Respiration of Plants—Cultivation of the a oo 
in the fabrication of Leghorn hats 363 
21. Non-vaporization of a irs tng in ele quantity 0 on an 
incandescent metal, 
22, 23, 24. New method of etme pibieien in Cholera 
~ Aerts Compost—New size for the Chain of 
n Cloth, 366 
25, 26. i Ditramarine—Singulae case > of ona ema- 
nations. 68 
QT. Gehting of Sones, - - - . - 369 
28. New instruments for measuring best, go 
29. Advantages of Bored Wells in communicating heat, - 373 
30. Limits of the Audibility of Sound, - 374 
31, 32. On the sepa of Plants—Shower of Flies. Singular _ 
pearance of the’Moon, - 
33. eas Mews . - - - - - on 
