CONTENTS. VH 



NUMBER PAGK 



XVI. On the Fossil Plants of the Kilmarnock, Galston, and Kilwinning Coal 

 Fields, Ayrshire. By Kobert Kidston, F.E.S.E., F.G.S. (Plates 

 I.-IV.), . . .307 



XVII. Electrolytic Synthesis of Dibasic Acids. By Professor A. Crum Brown 

 and Dr James Walker. II. On the Electrolysis of the Ethyl- 

 Potassium Salts of Saturated Dibasic Acids with Side Chains, and 

 on Secondary Reactions accompanying the Electrolytic Synthesis of 

 Dibasic Acids, ....... 361 



XVIII. On Impact, II. By Professor Tait, . . . . .381 



XIX. A New Algebra, by means of which Permutations can be transformed 

 in a variety of ways, and their properties investigated. By T. B. 

 Sprague, M.A., F.RS.E., ...... 399 



XX. On the Particles in Fogs and Clouds. By John Aitken, Esq., F.R.S., 



F.RS.E., . . . . . . . .413 



XXI. On the Path of a Rotating Spherical Projectile. By Professor Tait. 



(With a Plate), 427 



XXII. On the Present State of Knowledge and Opinion in regard to Colour- 

 Blindness. By William Pole, F.R.S., F.RS.E., Mus. Doc. Oxon., 

 Honorary Secretary of the Institution of Civil Engineers. (With 

 a Plate), ........ 441 



XXIII. On the Chemical Changes which take place in the Composition of 



the Sea-Water associated with Blue Muds on the Floor of the 

 Ocean. By John Murray, LL.D., Ph.D., and Robert Irvine, 

 F.C.S., 481 



XXIV. The Anatomy and Relations of the Eurypteridos. By Malcolm 



Laurie, B.Sc, B.A., F.L.S. Communicated by R. H. Traquair, 

 M.D., F.R.S., F.RS.E. (With Two Plates), . . .509 



