INDEX ir. 



12.9 



Peach (C. VV.) on some recent calcareous 

 zoophytes found at Ipswich, Harwich, 

 &c., 81. 



Pendulum experiments, at Oxford, 19; 

 mechanism to explain the, 117. 



Pens, gold, on an improved modification 

 of the reservoir for, 118. 



Pholades, on the branchite and mechanism 

 of breathing in the, 82. 



Pholas, on the branchial currents of, 74 ; 

 observations on, 82. 



Phillips (John) on the structure of the 

 crag, 67. 



Physical forces, on the correlation of vi- 

 tality and mind with the, 83, 



Physico-cliemical activity, on the cause 

 which maintains bodies in the sphe- 

 roidal state beyond the sphere of, 44. 



Physics, 1. 



Physiology, 70, 83. 



Plants, on some physical properties of the 

 solid and liquid constituent parts of, 19 ; 

 on the descent of the sap in, 72 ; fossil, 

 collected at Sunday river, on the Cape 

 frontier, 68. 



Political economy, a mathematical expo- 

 sition of some doctrines of, 110. 



Polygon, on the use of a, to ascertain the 

 intensity of the light at different angles 

 in the photographic room, 45. 



Population, fluctuations in the school, 99. 



Powell (Rev. Prof.), remarks on Lord 

 Brougham'^ experiments on light, &c., 

 in Phil. Trans, part i. 1850, 11; on M. 

 Guyot's experiment on the earth's ro- 

 tation, 23. 



Provost (M. Constant), explication d'un 

 tableau de I'etude methodique de la 

 Terre et du Sol, 68. 



Price (Joseph T.) on a method of con- 

 densing steam in marine engines, at 

 present employed in several steam ves- 

 sels in the Bristol Channel, 116. 



Pterodactyles of the chalk formation, on 

 the, 55. 



Pulvermacher's patent portable hydro- 

 electric cliain battery, on the construc- 

 tion and principles of, 52. 



Pyle (J. C), meteorological observations 

 made at Futtegurh, for the year 1850, 

 N. W. provinces, Bengal, 39. 



Railway communication from the Atlantic 

 to the Pacific in the territories of Bri- 

 tish North America, 111. 



Railway chairs and compressed wood fas- 

 tenings, on, ] 14. 



Rainbow, account of a lunar, seen near 

 St. Ives, Hunts, 41. 



Rankine (W. J. M.), summary of the re- 

 1851. 



suits of the hypothesis of molecular 

 vortices, as applied to the theory of 

 elasticity and heal, 3 ; on the velocity 

 of sound in liquid and solid bodies of 

 limited dimensions, especially along 

 prismatic masses of liquid, 4. 



Rankine (Rev. T.), register of meteoro- 

 logical phaenomena at Huggate in 

 Yorkshire, 36 ; on a mass of chalky 

 gravel, s\ipposed to be artificial, at 

 North Dalton, 69. 



Reeve (Lovell) on the geographical distri- 

 bution of the land mollusca, 82. 



Reid (Lieut. -Col.) on the law of storms — 

 on mooring ships in revolving gales, 36. 



Reindeer, antler of a, found near South- 

 wold, 69. 



Roberts (Richard) on mechanism to ex- 

 plain the pendulum experiments, 117. 



Robertson (J.), observations on Pholas, 82. 



Rocks, on the distribution of granite, 

 from Ben Cruachan, 59 ; of Lakes 

 Superior and Huron, on the age of the 

 copper-bearing, ib. ; of Scotland, on the 

 scratched and polished, 66. 



Rosse (The Earl of) on plain specula of 

 silver for reflecting telescopes, 12. 



Rudder, on the duplex, 110. 



Russell (Robert), observations on storms, 

 34. 



Sabine (Lieut. -Col.), letter to, from Cap- 

 tain E. J. Johnson, on the deviations 

 of the compasses of H. M. steam ships 

 Ajax and Blenheim, 8. 



Safety-valve, on an improved, 115. 



Sagitta, on the genus, 77. 



Salter (J. W.) on the fossils from the Ot- 

 tawa river, 63. 



Salts, on the constitution of, 54. 



Saull (W. D.) on the ethnology and ar- 

 chaeology of the Norse and Saxons, in 

 reference to Britain, 90. 



Savings-banks, on the duties of the public 

 in respect to charitable, 103. 



Saxons, on the ethnology and arcliasology 

 of the, in reference to Britain, 90. 



Schafhaeutl (Dr.) on klinology in refer- 

 ence to the Bavarian Alps, 69. 



Scharling (Prof. E. A.) on the action of 

 superheated steam upon organic bodies, 

 51. 



Schomburgk (Sir R.), ethnological re- 

 searches in Santo Domingo, 90. 



Schools for children of the poorer classes, 

 statistics of the attendance in, 99. 



Science, on the influence of discoveries in, 

 in developing the condition of a people, 

 108. 



Scoffern (Dr.) on gambogic acid and the 

 9 



