xxn CONTENTS. 



PAGE 



IX. — On Spectra formed by the Passage of Polarized Light through 

 Refracting Crystals. By Francis Deas, M.A., LL.B., 

 F.R.S.E., 177 



Addition to the above Paper. By J. Clerk Maxwell, LL.D., 



F.R.SS., L. & E., 185 



X. On the Oxidation of Products of Picoline. By James Dewar, 

 F.R.S.E., Chemical Demonstrator in the University of 

 Edinburgh, and Lecturer on Chemistry at the Edinburgh 

 Veterinary College, . . . . .189 



XI. An Account of the Great Finner Whale (Bakenoptera Sib- 

 baldii) stranded at Longniddry . Part I. — The Soft Parts. 

 By William Turner, M.B., (Loncl.), Professor of Anat- 

 omy in the University of Edinburgh. (Plates V.-VIIL), 197 



PAKT II. (1870-71.) 



XII. On Some Points in the Structure of Tubifex. By W. C. 



M'Intosh, M.D., F.R.S.E. (Plates IX. and X.), . 253 



XIII. — On the Place and Power of Accent in Language. By Pro- 

 fessor Blackie, ....... 269 



XIV. — On the Average Quantity of Rain in Carlisle and the Neigh- 

 bourhood. By Thomas Barnes, M.D., F.E.S.E., . 313 



XV. — On the Physiology of Wings, being an Analysis of the Move- 

 ments by ivhich Flight is produced in the Insect, Bat, and 

 Bird. By James Bell Pettigrew, M.D., F.RS., Path- 

 ologist to the Royal Infirmary of Edinburgh, and Curator 

 of the Museum of the Royal College of Surgeons of 

 Edinburgh. Communicated by Professor Turner. 

 (Plates XI. to XVI.), . . . .321 



