296 



SECTIONS. INDEX OF SUBJECTS. 



Potassium, W. Petrie on the phosphores- 

 cence of, 1850, 59. 



and carbon, Prof. E. Davy on a com- 

 pound of, 1836, 63. 



and iron, Prof. Calvert and E. Johnson 



on alloys of, 1855, 50. 



Potato, Dr. Kemp on the disease of ttie, 



1846, 44. 



, W. Hogan on the means of obviating 



the ravages of the disease in the, 1846, 89. 

 , on proposed substitutes for the, 1846, 



90. 

 , on the nutritive properties of the, as 



compared with wheat, by J. W. Eogers, 



1857, 57. 

 crops, on the preservation of the, by 



Chevalier Claussen, 1855, 54. 

 seeds, J. D. Murray on the vitality of, 



1847, 86. 



Potatoes, Chevalier Claussen on the effect of 

 sulphate of lime upon, 1853, 38. 



Poverty and crime, statistics bearing upon 

 the relations existing between, by W. M. 

 Tartt, 1856, 159. 



Powell's (Prof.) measures of the indices of 

 refraction for the lines " G" and " H" in 

 the spectrum, Sir D. Brewster on, 1840, 5. 



Power-loom, new, notice of a, 1854, 156. 



Preservation of fresh meat, results of experi- 

 ments on the, by G-. Hamilton, 1854, 69. 



of milk, notice of a process for the, 



1854, 74. 



Pressure, on the solidification of bodies 

 under, by W. Fairbairn, 1854, 149. 



, its effect on the temperature of fusion 



of different substances, W. Hopkins on, 

 1854, 57. 



Pressure-gauge, deep-sea, on a, 1859, 236. 



Provost's theory of exchanges, experiments 

 on radiant heat involving an extension of, 

 by B. Stewart, 1858, 23. 



Priapulus caudatus. Prof. Phillips on a 

 living specimen of, 1853, 70. 



caudatus, notice on, 1854, 113. 



Prices and wages during the years from 

 1842-49, G^. B. Porter on a comparative 

 statement of, 1849, 101. 



, on a form of table for collecting re- 

 turns of, in Ireland, by Prof. W. N. Han- 

 cock, 1849, 92. 



Principal relations. Sir W. R. Hamilton on 

 the calculus of, 1836, 41. 



Printing-press, imiversal, T. J. Silbermann 

 on a, 1858, 220. 



Prionites superciliosus fromjMexico,1837,99. 



Prism of crystals of chromate of lead, 1837, 

 18. 



, Nicol's, on a new polarizer resulting 



from a modification of, by L. Foucaidt, 

 1857, 5. 



, on its use in detecting impurities, by 



Dr. J. H. Gladstone, 1857, 48. 



Prison, Wakefield, on the influence of various 

 circumstances in causing loss or gain in 

 the weight of the prisoners, bv W. B. 

 Milner, 1858, 139, 



Prisons, on the effect of good and bad times 

 on committals to, by Eev. J. Clay, 1854, 



133- 



Probabilities, calculus of. Sir W. R. Hamil- 

 ton on some investigations connected with 

 the, 1843, 3. 



, on a principle in the theory of, by 



Prof. Young, 1844, i. 



Procellaria, on a new species of, 1831-32, 



598- 



Thetis, a new Thalassidroma from the 



Galapagos, 1852, 72. 



Projectiles, W. B. Adams on, 1835, 203. 



, on the mutual influence of capillary 



attraction and motion on, by J. Gall, jun., 

 1855, 206. 



Projection, isometrical, T. Sopwith on in- 

 struments to facilitate the drawing of ob- 

 jects in, 1838, 154. 



Propeller, chain, Robertson's patent, P. 

 Spence on, 1859, 243. 



, Fisher's Venetian screw, J. Grantham 



on, 1854, 151. 



, marine, invented about the year 1825 



by J. Perkins, J. I. Hawkins on the, 1843, 

 100. 



Proteunogenic bodies, Dr. Kemp on, 1845, 



31- 



Protocarbide of iron for the purification of 



water, T. Spencer on, 1859, 85. 

 Protochlorides of platinum and tin, 1835,44. 

 Protococcus nivalis, Prof. Agassiz on, 1840, 



H3- 

 nivalis, M. Moggridge on a peculiarity 



in the, 1848, 86. 

 Protoxide of lead, atomic weight of, 1839, 44. 

 Prussian blue. Prof. T. Thomson on its 



manufacture in Glasgow, 1840, 62. 

 Prussiates, yellow and red. Dr. Letheby on 



the difference in the physiological actions 



of the, 1846,41. 

 Psalidognathus Friendii, Mr. Wailes and 



Mr. Adamson's notice of, 1838, 113. 

 Psammodus, Prof. Owen on the teeth of the 



genus, 1838, 140. 

 Psychometer, or measurer of refrigeration, 



by Dr. Osborne, 1835, 95. 

 Psychrometer, self-registering, C. Brooke on 



a, 1846, 17. 

 Pteraspis, on the genus, by Prof. Huxley, 



1858, 82. 

 Pterichthys, on the restoration of, in * The 



Testimony of the Rocks,' by Rev. Dr. 



Longmuir, 1859, 263. 



Milleri, notice of, 1840, 99. 



Pterochilus, a new genus of nudibranchiate 



mollusca, notice of, 1844, 66. 

 Pterodactyle, on a new genus (Dimorpho- 



don) of, with remarks on the geological 



distribution of flying reptiles, by Prof. 



Owen, 1858, 97. 

 , on remains of new and gigantic spe- 

 cies of (P. Fittoni and P. Sedgwickii), 



by Prof. Owen, 1858, 98. 

 Pterodactyles of the chalk-formation, J. S. 



Bowerbank on the, 1851, 55. 



