186 



Price (J.) on an improved method ol" 

 constructing railways, 158. 



on a steam-engine boiler, 162. 



Psalidognathus Friendii, 113. 



Psammodus, on the teeth of the 

 genus, 140. 



Ptychodus latissimus.onthe structure 

 of the tooth of, 140. 



Pulmonifera, terrestrial, on the distri- 

 bution of, 112. 



Raia chagrinea, 109. 



• intermedia, 109. 



Railway with cast-iron sleepers, on 

 the construction of a, 157. 



Railways, improved method of con- 

 structing, 158. 



Rain, variations in the quantity of, 27. 



Rain-gauge, effectof deflected currents 

 of air on, 25. 



Ramsbottom, statistics of, 168. 



Rats, pouched, 105. 



Rawson (W. R.) on the mimber of 

 fires in the metropolis, 170. 



, report of the railway commis- 

 sioners in Ireland, 171- 



Rees (Dr. G. O.) on the Liquor 

 Amnii, 126. 



Reid (Lt.-Col.) on the law of storms, 

 21. 



Reid (Dr. D. B.) on the amount of 

 air required for respiration, 131. 



Reid (Dr. J.) on the functions of the 

 eighth pair of nerves, 124. 



Reptiles, on the teeth of, 144. 



Resin of gamboge, and its compounds, 

 60. 



Respiration, amount of air required 

 for, 131. 



, cause of the sound of, 122. 



, artificial, apparatus for pro- 

 moting, 127. 



Richardson (Dr. J.) on pouched rats, 

 105. 



Richardson (T.) on enlulsin, 48. 



— ■ — , examination of sphene, 49. 



Robison (Sir J.) on a barometrical 

 instrument for travellers in moun- 

 tainous districts, 37. 



Rocks, on the stratification of, 88. 



Rowley (S.) on a new rotatory steam- 

 engine, 162. 



Russell (J. S.) on the resistance of 

 water, 163. 



Salts of mcrcurv, new, "2. 



Samuda(Mr.) on Clifl''s dry gas meter, 



158. 

 Sauroid fishes, on the fossil teeth of, 



90. 

 Scanlan (Mr,) on the constitution of 



the commercial carbonate of Eun- 



monia, 63. 

 on the blackening of nitrate of 



silver by light, 63. 

 Shell, new British, 110. 

 Shells of moUusca, on the annular 



marks on, 111. 

 Ship building, on improvements in, 



157. 

 Siberia, on the frozen soil of, 96. 

 Silver, crystals of, on the production 



of, 74. ' 

 , new process for its extraction 



from lead, 50. 



, nitrate of, blackened by light, 63. 



Silurian system of strata, on the, 80. 

 rocks in the county- of Tyrone, 



84. 

 Sleep, on, 127. 



Smelt, on a new species of, 108. 

 Smith (J.) on the shells of the newer 



pleiocene deposits, 87- 

 Smith (Dr. W.) on the variations in the 



quantity of rain in different parts of 



the earth, 27. 

 Sopwith (T.) on the mountain lime- 

 stone formation in Alston Moor, 79. 



on the construction of geological 



models, 94. 



on an improved leveling stave, 



154. 



, description of instruments to fa- 

 cilitate the process of isometrical 

 projection, 155. 



on improved writing-cabinets, 



156. 



on the importance of preserving 



national mining records, 156. 

 Sphene, examination of, 49. 

 Spittal (Dr.) on the cause of the sounds 



of respiration, 122. 

 Statistics, 165. 

 StCEun- boilers, a substitute for the 



forcing-pump in supplying, 163. 

 Steam-engine boiler, on a, 162 ; on 



the manufacture of, 160 ; on the 



construction of, 162. 

 Steam-ships, iron, on correcting the 



local magnetic action of the compass 



in, 2 1 . 

 Sores, on certain species of, 104. 



