TRANSACTIONS 



6P THE 



ROYAL SOCIETY OF EDINBURGH 



VOL. XXXII. PART I.— FOR THE SESSION 1882-83. 



CONTENTS. 



Page 

 Art. I. — The Pycnogonida dredged in the Farce Channel during the Cruise of H.M.S. 

 "Triton" (in August 1882). By Dr P. P. C. Hoek, Member of the Eoyal 

 Academy of Science of the Netherlands. (Plate I.), ., . . 1 



II. — Bright Clouds on a Dark Night Sky. By C. Piazzi Smyth, Astronomer-Eoyal for 



Scotland. (Plates II. to XIV.), . . . . . .11 



III. — Note on the Little b Group of Lines in the Solar Spectrum and the new College 

 Spectroscope. By C. Piazzi Smyth, Astronomer - Eoyal for Scotland 

 (Plate XV.), 37 



IV. — Observations on the Annual and Monthly Growth of Wood in Deciduous and Ever 

 green Trees. By the late Sir Eobebt Christison, Bart., and Dr Christison, 



V. — A Contribution to the Chemistry of Nitroglycerine. By Matthew Hay, M.D. 

 Assistant to the Professor of Materia Medica in the University of Edinburgh, 



45 



67 



VI. — The Elementary Composition <of Nitroglycerine. By Matthew Hay, M.D., and 



Orme Masson, M.A., B.Sc, . ... . . . .78 



VII. — Report on the Tunicata collected during the Cruise of H.M.S. "Triton" in the 

 Summer of 1882. By W. A. Herdman, D.Sc, Professor of Natural History 

 in University College, Liverpool. (Plates XVI. to XX.), . . .93 



VIII. — Report on the Pennatidida dredged by H.M.S. " Triton." By. A Milnes Marshall, 

 M.D., D.Sc, M.A., Fellow of St John's College, Beyer Professor of Zoology in 

 Owens College. (Plates XXI. to XXV.), . . . . .119 



IX. — Asteroidea dredged in the Faeroe Channel during the Cruise of H.M.S. " Triton " 

 in August 1882. By W. Percy Sladen, F.L.S., F.G.S. Communicated by 

 John Murray, F.E.S.E. (Plate XXVI.), . . . . .153 



[For remainder of Contents, see last page of Cover. ] 



