Vlll CONTENTS OF VOL. XXII. FOURTH SERIES. 



Page 

 Proceedings of the Royal Society : — 



Mr. W. T. Shaw on the Stereotrope 537 



Mr. H. J. S. Smith on Systems of Linear Indeterminate 



Equations and Congruences 539 



Drs. De la Rue and Muller on Terephthalic Acid and its 



derivatives 541 



Dr. Matthiessen on the Electric Conducting Power of Cop- 

 per and its Alloys 545 



Dr. Frankland on Combustion in Rarefied Air 549 



Note on the Freezing of Saline Solutions, by M. Rudorff .... 552 



Experiments on some Amalgams, by J. P. Joule, LL.D. . . . 554 

 Preliminary Note on the Production of Vibrations and Musical 



Sounds by Electrolysis, by George Gore, Esq 555 



Index , 556 



ERRATA IN VOL. XXI. 



Page 407, line 2, for t=247 0, 45 read £=247°-45. 



— line 3, for g=6U°-28 read r=61 1°-28. 



— line 4, for hence fih ~^—~- read hence ph= 1^. 



A /3 



415, last line of Note H, for between L and V read between L and 



PLATES. 



I. Illustrative of Prof. Magnus's Paper on the Propagation of Heat in 

 Gases. 



II. Illustrative of Mr. F. Galton's Paper on Meteorological Charts. 



III. Illustrative of Prof. Tyndall's Paper on the Absorption and Radia- 



tion of Heat by Gases and Vapours. 



IV. Illustrative of Mr. C. Tomlinson's Paper on the Cohesion-Figures of 



Liquids. 



V. Illustrative of MM. Kirchhoff and Bunsen's Paper on Chemical Ana- 

 lysis by Spectrum-observations. 



VI. Illustrative of Mr. W. S. Jevons's Paper on the Deficiency of Rain in 

 an elevated Rai n-gauge ; of Dr. Lamont's Paper on the Form of 

 Magnets ; and MM. Kirchhoff and Bunsen's Paper on Chemical 

 Analysis by Spectrum-observations. 



