650 INDEX. 



Diferentiation, on general, 241. 



Digits of Numbers, on the sums of the, 87. 



Distillation of Animal Substances, on the products of the destructive, 463. 



Dry gases on organic colouring matters, on the action of the, 475. 



E 



Earth, on the temperatures of the, 189. 



Earth's magnetism, the relation of the variations of the, to the solar and lunar periods, 99, 137- 



Eye, possible explanation of the adaptation of the, to distinct vision at diflerent distances, 1 . 



Eye, and other phenomena of vision, on the gradual production of luminous impressions on the, 581. 



F 



E%nite Divisibility of Matter, 79. 



Fluoride of calciiim, on the solubility of, in water, 145. 



Forbes (James D.) On a possible explanation of the adaptation of the eye to distinct vision at dif- 

 ferent distances, 1. Account of some experiments on the temperature of the earth at different 

 depths, and in different soils, near Edinburgh, 189. Remarks on Mr Caldecot's observations 

 on the temperature of the groimd at Trevandrum, in India, 392. 



Freezing Point of Water, effect of pressure in lowering the, 575. 



Fund, account of the Keith, i. 



a 



Gases, the action of dry, on organic colouring matters, 475. 

 Goniometry, an attempt to elucidate and apply the principles of, 345. 



Gregohy (William) M.D. On the extraction of pure phosphoric acid from bones, and on a new and 

 anomalous phosphate of magnesia, 47. 



H 



Hansteen (Christopher.) On a formula representing the mean height of the barometer at the level 



of the sea, 237. 

 Heat, Carnot's theory of the motive power of, 541. 

 Hope (Thomas Charles) M.D. Memoir of, 49. 



I 



Iceland Spar, experiments on the ordinary refraction of, 375. 



K 



Keith Fund, account of the, i. 



Kellaxd (Rev. Philip) M.A. On general differentiation, 241. 



L 



Light, the decomposition and dispersion of, within solid and fluid bodies, 111. 



Lochaber, on the parallel roads of, 396. 



Luminous Impressions on the Eye, and other Phenomena of Vision, on the gradual production of, 581 . 



Lunar and Solar Periods, the relation of the variations of the earth's magnetism to tlie, 99, 137. 



