468 



INDEX. 



Streams, on the thermodynamic acce- 

 leration and retardation of, 288. 



Stmtt (the Hon. J. W.) on the tones 

 of heated tubes and aerial vibra- 

 tions in pipes of various forms, 211. 



Sulphuric acid, on the determination 

 of the resistance of dilute, by means 

 of alternate currents, 227. 



Sun, on the relation between the alti- 

 tude and chemical intensity of the, 

 56 ; on the temperature and phy- 

 sical constitution of the, 313. 



Temperature, on supra-annual cycles 

 of, in the earth's surface-crust, 58. 



Thermodynamics, on, 51, 103, 218, 

 429. 



Thermometers, on deep-sea, 132. 



Thermopiles, on the construction of, 

 369. 



Thorpe (Prof. T. E.) on the relation 

 between the sun's altitude and che- 

 mical intensity, 56. 



Tomlinson (C.) on supersaturated sa- 

 line solutions, 221 ; on the action 

 of low temperatures on supersatu- 

 rated saline solutions, 295 ; on a 



salt that is invisible in its mother- 

 liquor, 328. 



Tones of heated tubes, onthe, 211. 



Vanadium, researches on, 62. 



Vibration, on approach caused by, 345. 



Vowels, on the fixed notes charac- 

 teristic of the various, 145. 



Warren (T. T. P. B.) on a new me- 

 thod of determining resistances, 

 441. 



Watersheds and watercourses, on, 425. 



Watts (Dr. W. M.) on the spectra of 

 carbon, 100. 



Wave-lengths, on the measurement of, 

 by means of indices of refraction, 

 177. 



Wernicke (W.) on the refractive in- 

 dices and the dispersion of opaque 

 bodies, 105. 



Wheatstone (Sir C.) on a cause of 

 error in electroscopic experiments, 

 128. 



Zollner (Prof. F.) on the temperature 

 and physical constitution of the 

 sun, 313; on solar protuberances, 

 427. 



END OF THE FORTIETH VOLUME. 



PRINTED BY TAYLOR AND FRANCIS, 

 RED LION COURT, FLEET STREET. 



