536 



INDEX. 



tion, 50 ; ou the euumeratiou of 

 the contacts of lines and surfaces 

 of the second order, 331 ; ou a 

 formula bj' aid of which and of a 

 table of single entry the continued 

 product of any set of numbers may 

 be effected without the use of loga- 

 rithms, 430. 



Symmetric products, on the method 

 "of, 130. 



Tantalite, ou the nomenclature of the 

 metals contained in, 461. 



Testacea, on the remains of colour in 

 fossil, as an indication of the depth 

 of primeval seas, 437- 



Tbermo-dynamic engines, on the 

 theory of, 288. 



Thiacetic acid, on the preparation and 

 composition of, 511). 



Thompson (Dr. T.) on the changes 

 produced in the blood by the ad- 

 ministration of cod-liver oil and 

 cocoa-nut oil, 521. 



Thomson (Prof. W.) on the oeconomy 

 of the heating or coohng of build- 

 ings by means of currents of air, 

 138 ; on the mechanical values of 

 distributions of electricity, mag- 

 netism and galvanism, lf^2 j on the 

 heat produced by an electric dis- 

 charge, 34/ ; on the uniform mo- 

 tion of heat in homogeneous solid 

 bodies, and its connexion with the 

 mathematical theory of electricity, 

 502. 



Tourmalines, on the manufacture of 

 artificial, 352. 



Triffonocarpon, on the structure and 

 affinities of, 515. 



Tyndall (Dr. J.) on the progress of 

 the ]5hysical sciences, 33 ; on the 

 vibration and tones produced by 

 the contact of bodies having differ- 

 ent temperatures, 223. 



Urea, on a new and simple method of 



determining the amount of, in tl.e 

 urinary secretion, 385. 



Vertebral system, on the development 

 of tlie, 447. 



Vogel (Dr. E.) on some astronomical, 

 meteorological and maguetical ob- 

 servations, made between Tripoli 

 and Mourzuk, Gii. 



Voltameter, description of a new, 77- 



Water, on the decomposition of, by 

 the galvanic battery, 73, 298, 42(), 

 52(;. 



Weber (Prof.W.) on the application of 

 magnetic induction to the determi- 

 nation of the magnetic incluiation, 

 153. 



Wedgwood (Mr.) on the geometry of 

 the first three books of Euclid, 442. 



Wheatstone (C.) on Fessel's gyro- 

 scope, 522. 



Wiedemann (G.) on the eonductibility 

 ot metals for heat, 33. 



Wilbraham (II.) on the theory of 

 chances developed in Prof. Boole's 

 " Laws of Thought," 465. 



Williamson (Prof. A.) on the decom- 

 position of sulphuric acid by pen- 

 tachloride of phosphorus, 365 ; on 

 some new compounds of phenyle, 

 370. 



Wilsonite, on the composition of, 500. 



Wine, on the acidity, sweetness and 

 strength of, 143. 



Wittwer (M.) on the force which 

 governs chemical action, 528. 



Wbhler (Prof.) on the influence of 

 pressure uj)on the formation of 

 chemical compoimds, 150 ; on 

 some peculiar reductions of metals 

 in the humid way, 297- 



Wood (S. V.) on some tubular cavi- 

 ties in the coralline crag at Sud- 

 bourn and Gedgrave near Orford, 

 320. 



Xanthoxyline, analysis of, 28. 



END OF THE SEVENTH VOLUME. 



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