38o 



INDEX. 



Society of th: Friends of Science, 



JVarsavj, 279 



Sound reflected from a concave 



173 



286 

 Pa- 



57,3 

 S7 



mirror, 

 Spii/er. Ingenuity of the. 

 Specific gravities of fluids. 



tent for determining, 

 Spring ivheat., a pi-emium, 



Strata of coal-pits described, 



203 



Steam-e7igines. Patent, 374 



Stci\m-i.<cheel. Patent, 374 



Succinate of iron decomposed by 



boiling water, 186 



Su^cr cane. Hindoo method of 



cultivating, 204 



Sulphate of iron used as manure, 



52 



Snip burets, metallic. On, 133, 



2o3, 213 



Tea Tree. Account of, 256 



Temperature of the sea, 129 ; of 

 high regions, 227 



Thompon's-p?ittn\., 95 



Thornton on pneumatic medi- 

 cine, 126 

 Thrashing machine. Patent, 95 

 Thrashing machine, 372 

 Thunder's patent. 95 

 Tilloch on extinguishing acci- 

 dental fires in ships, 97 ; on 

 making platina malleable, 175 

 Time-keepers. Improvement in, 



Travels to promote science, 279 



280, 281,353 



Tyher. Inundation of the, 191 



Ulcers cured by Inhaling oxygen 



gas, 128 



Vaccination, On, go, 183, 37O 

 Vegetation. Oxide of iron, sul- 

 phate, and other salts^ pro- 

 mote, 5? 

 Vesuvius. Eruption of, 94 

 Voyages, 88 

 Volcanoes. On, 2 84 



Water of the sea. On tempera- 

 ture of, 129 



Water formed by uniting oxy- 

 gen and hydrogen mechani- 

 cally, 288, 362 



Wax from lac, I3j 18 



Wheat, a premium, 87 



Wilkins on an universal measure, 

 167 



IVindo'Zfs. Patent, 95 



Woods on the electrophorus, 



289 



Wollaston's discovery of palla- 

 dium, 89; of rhodium, 90 



Wren (Sir Christopher) first pro- 

 posed deriving a measure from 

 the pendulum, 168 



IVright on measuring the me- 

 ridian, 164; on a universal 

 measure, i66 



Wright's patent, 374 



'Tin vessels. On, 318 



Tinning of copper, 3 1 3 



Topographical improvement, z^i 

 Trade of Siam, 22 



Travels, 88 



END OF THE TWENTY-FIRST VOLUME 



Z/z/iT employed for coin In China, 



242 ; on alloys of, 313 



ZoQlogy, 2 S 



ERRATA. 



In our igth volume, p. 311, tlie 7th line from the bottom, for four 

 jKinutes read eight minuiis. 



In the present volume, p. 254, to the title of tlie article on a Safety- 

 valve add, — By tlje Cbrvalier EdeLrant%, of Sweden. 



Pruitfd by R.fl'ayloT and Co., iiS, iihoc Lane, Fleet tilTuet. 



\y 



