[ V ] 



XXII. On the Tides of the Arctic Seas. By the Eev. Samuel Haughton, M.B., F.R.S., 

 Fellow of Trinity College, Dublin. — Part III. On the Semidiurnal Tides of 

 Frederiksdal, near Cape Farewell, in Greenland page 639 



XXIII. On Uniform Botation^ By C. W. Siemens, F.B.S., Mem. Inst. C.E. . 657 



XXIV. Researches on the Structure, Physiology, and Development of Antedon (Coma- 

 tula, Lamk.) rosaceus. — Part I. By William B. Caepenter, M.D., F.B.S. 671 



XXV. On the Motion of a Rigid Body acted on by no external Forces. By J. J. 

 Sylvester, LL.D., F.R.S 757 



XXVI. The Calculus of Chemical Operations ; being a Method for the Investigation, by 

 means of Symbols, of the Laws of the Distrihution of Weight in Chemical Change. 

 — Part I. On the Construction of Chemical Symbols. By Sir B. C. Brodie, Bart., 

 F.R.S. , Professor of Chemistry in the University of Oxford 781 



XXVII. On the Expansion by Heat of Metals and Alloys. By A. Matthiessen, 

 F.R.S . 861 



Index 883 



Appendix. 

 Presents [ 1 1 



