PLATES. 



I. Illustrative of Prof. J. Joly's Paper on Scientific Signalling and 

 Safety at Sea. 

 II. -V. Illustrative of Prof. Barton and Miss Browning's Paper on 

 Variably-Coupled Vibrations : III. Both Masses and Periods 

 Unequal. 

 VI. Illustrative of Mr. H. A. Webb and Dr. J. R. Airey's Paper on 

 the Practical Importance of the Confluent Hypergeometric 

 Function. 

 VII. Illustrative of Prof. E. Taylor Jones's Paper on the Potential 

 generated in a High-tension Magneto. 

 VIII. & IX. Illustrative of Prof. Barton and Miss Browning's Paper on 

 Forced Vibrations Experimentally Illustrated. 

 X. Illustrative of Mr. G. A. Hemsalech's Paper on a Comparative 

 Study of the Flame and Furnace Spectra of Iron. 

 XL & XII. Illustrative of Prof. McLennan and Mr. Young's Paper on 



the Ultraviolet Spectra of Magnesium and Selenium. 

 XIII.-XV. Illustrative of Prof. McLennan and Mr. Ireton's Paper on 

 Fundamental Frequencies in the Spectra of Various Elements. 



