CONTENTS (continued). 



JTay 29, 1879. 



PAGE 



I. On the Conduction of Heat in Ellipsoids of Revolution. By C. Nivex, 



M.A., Professor of Mathematics in Queen's College, Cork . . .98 

 II. On a New Method of Investigating the Magnetic Lines of Force in 

 Magnets, demonstrating the Obliquity of the Equator and Axis of Bar 



Magnets. By Richard C. Siiettle, M.D 102 



III. Preliminary Report to the Committee on Solar Physics on a Method of 

 Detecting the Unknown Inequalities of a Series of Observations. By 

 Balfour Stewart, F.R.S., Professor of Natural Philosophy in Owens 



College, Manchester, and "William Dodgson 106 



IV. Researches on Explosives. No. II. (Fired Gunpowder.) By Captain 

 Noble, late R.A., F.R.S., F.R.A.S., F.C.S., and F. A. Abel, C.B., 



F.R.S., V.P.C.S . .123 



Y. Note on the Spectrum of Sodium. By J. Norman Lockyer, F.R.S. . 140 

 ist of Presents 141 



Erratum : Vol. xxviii, Mr. Gordon's Paper, pp. 156, 157. 



The refractive indices given for hard crown and for light flint must be inter- 

 hanged, as it has been found that the polisher to whom the prisms were entrusted 

 as interchanged the H. C. and L. F. labels. 



GOVERNMENT GRANT OF £1000. 



A Meeting of the Government -Grant Committee will be held in February, 1880. 

 It is requested that applications to be considered at that Meeting be forwarded to 

 the Secretaries of the Royal Society, Burlington House, before the 31st December, 

 1879. • 



GOVERNMENT FUND OF £4000 



FOR THE PROMOTION OF SCIENTIFIC RESEARCH. 



A Meeting of the Government-Fund Committee will be held in February, 1880. 

 It is requested that applications to be considered at that Meeting be forwarded to 

 the Secretaries of the Roval Society, Burlington House, before the 31st of December, 

 1879. 



PHILOSOPHICAL TRANSACTIONS, 

 Part II (1878), vol. 169, price £3. 



Extra volume (vol. 168) containing the Reports of the Naturalists attached to the 

 Transit of Venus Expeditions. Price £3. 



Sold by Harrison and Sons. 



Separate copies of Papers in the Philosophical Transactions, commencing with 1875, 

 may be had of Triibner and Co., 57, Ludgate Hill. 



HARRISON AND SONS, 45 & 46, ST. MARTIN'S LANE, W.C., 

 and all booksellers. 



