VI CONTENTS. 



ARTICI-E PAGE 



XIV. — On Compound Combinatious. Bj Professor Caylf.y, 



F.R.S. &c 99 



XV. — On Ternary Differential Equations. By Robert Rawson, 



Esq., Hon. Member of the Society i oi 



XVI.— Results of the Monthly Observations of the Magnetic Dip, 

 Horizontal Force, and Declination, made at the Magnetic 

 Observatory of the Owens College, from January 1874 to 

 December 1876, inclusive. By Professor Thomas H. 

 Core, M.A 106 



XVII. — Inquiries concerning a Change in the Position of the Earth's 



Axis. By Arthur W. Waters, F.G.S 110 



XVIII. — Losses and Gains in the Death-toll of England and Wales 

 during the last Thirty Years. By Arthur Ransome, M.A., 

 M.D 126 



XIX. — List of Desert-Plants collected at Ramleh, near Alexandria, 

 Egypt, from September 1875 to April 1876. By H. A. 

 Hurst, Esq 141 



XX.— On some Thionates. By H. Baker, Student in tlie Owens 



College 157 



XXI. — On the Formation of Hailstones, Raindrops, and Snow- 

 flakes. By Profe.ssor O. Reynolds, M.A., F.R.S 161 



XXII. — On the Origin of some Ores of Copper. — Part I. By 



Charles A. Burghardt, Ph.D., The Owens College 171 



XXIII. — On the Construction of a Room or Series of Rooms free 

 from Germ Life, proposed for use in the performance of 

 Siu-gical Operations. By William Thomson, F.R.S.E.... 180 



XXIV. — Note on Metallic Niobium and a new Niobium Chloride. By 



Professor H. E. Roscoe, F.R.S. &c 186 



XXV. — On the Geometi'ical Representation of the Equation of the 

 Second Degree. By Charles Chambers, F.R.S., Super- 

 intendent of the Colaba Observatory, Bombay 192 



dx 



Robert Rawson, Esq., Assoc. I.N. A., Hon. Member of 

 the Manchester Literary and Pliilosophical Society, 

 Memb. of the London Math. Society 201 



XXVII. — Notice of a Fossil Plant found at Laxey, in the Isle of Man. 



By E. W. BiNNEY, F.R.S., F.G.S., President 214 



r> "■ ux 

 XXVI.— On tlie Cubic Integral u- ~~, . By 



