VI. Researches on Explosives. Part III. By Sir ANDREW NOBLE, Bart., K.C.B., 



F.R.S., F.R.A.S. page 201 



VII. Colours in Metal Glasses, in Metallic Films, and in Metallic Solutions. II. 



By J. C. MAXWELL GARNETT. Communicated by Professor Larmoi; 

 Sec.RS. 237 



VIII. On the Intensity and Direction of the Force of Gravity in India. By 

 Lieut.-Colonel S. G. BURRARD, H.E., F.R.S. 289 



IX. On the Refractive Index of Gaseous Fluorine. By C. CUTHBERTSON and 



E. B. II. PRIDEAUX, M.A., B.Sc. Communicated by Sir WILLIAM RAMSAY, 

 K.C.B., F.R.S 319 



X. Modified Apparatus for the Measurement of Colour and its Application to the 



Determination of the Colour Sensations. By Sir WILLIAJI DE W. ABNEY, 

 K.C.B., F.R.S. 333 



XL The Pressure of Explosions. Experiments on Solid and Gaseous Explosives. 

 Parts I. and II. By J. E. PETAVEL. Communicated by Professor ARTHUR 

 SCHUSTER, F.R.S 357 



XII. Fifth and Sixth Catalogues of the Comparative Brightness of the Stars in 



Continuation of tfiose Printed in the 'Philosophical Transactions of the Royal 

 Society' for 1796-99. By Dr. HERSCHEL, LL.D., F.R.S. Prepared for 

 Press from the Original MS. Records by Col. J. HERSCHEL, R.E., 

 F.R.S. 399 



XIII. On the Accurate Measurement of Ionic Velocities, with Applications to Various 

 Ions. By K. B. DENISON, M.Sc., Ph.D., and B. D. STEELE, D.Sc. Com- 

 municated by Sir WILLIAM RAMSAY, K. C.B., F.R. S. 449 



XIV. On Mathematical Concepts of the Material World. By A. N. WHITEHEAD, 



Sc.D., F.R.S., Fellow of Trinity College, Cambridge 465 



Index to Volume 527 



