INDEX. 651 
Magnesia, on a new and anomalous phosphate of, 47. 
Magnetometer, Balance, and its mean corrections, 67. 
Matter, finite divisibility of, 79. 
Milk and Blood, observations on, 53. 
Maxwet1 (JAMES CrzrK). On the theory of rolling curves, 519. 
Metallic Reflectors for sewtants and other reflecting mstruments, on the use of, 61. 
Minx (Davin). On the parallel roads of Lochaber, with remarks on the change of relative levels 
of sea and land in Scotland, and on the detrital deposits in that country, 395. 
Minerals, on the existence of crystals with different primitive forms and physical properties in the 
cavities of, 11. 
Morinda citrifolia, on the colouring matter of the, 435. 
N 
Negative quantites, on the square roots of, 345. 
Numbers, on the sums of the digits of, 87. 
O 
Oils, decomposition of the fixed, in contact with sulphur, on certain products of, 363. 
iP 
Parallel Roads of Lochaber, on the, 395. 
Phosphate of Magnesia, on a new and anomalous, 47. 
Phosphoric Acid from Bones, on the extraction of 47. 
Picoline, a new organic base from coal-tar, on the constitution and properties of, 123. 
Pressure in Lowering the Freezing Point of Water, theoretical consideration on the effects of, 575. 
R 
Ramsay (Rev. E. B.) Biographical notice of the late Thomas Chalmers, D.D., & LL.D., 497. 
Reaction of natural waters with soluble lead salts, on the, 357. 
Reenavut’s Experiments on steam, numerical results deduced from, 541. 
Roads of Lochaber, on the parallel, 395. 
Rolling Curves, on the theory of, 519. 
S 
Salts, on the reaction of natural waters with soluble lead, 357. 
Sextants and other reflecting instruments, on the advantages to be derived from the use of metallic 
reflectors for, 61. 
Smytu (C. Prazz1). Notice of the orbit of the binary star « Centauri, as recently determined by Capt. 
W. S. Jacob, Bombay Engineers, 445. An attempt to improve the present methods of deter- 
mining the strength and direction of the wind at sea, 455. 
Solar and Lunar Periods, the relation of the variations of the earth’s magnetism to the, 99, 137. 
Solid and Fluid Bodies, the decomposition and dispersion of hight within, 111. 
Spar, experiments on the ordinary refraction of Iceland, 375. 
Star, notice of the orbit of the binary, a Centauri, 445. 
