CONTENTS. 



PART I. 



'f 



30 



I Account of some Experiments made in Different Parts of Europe, on 

 Terrestnal Magnetic Intensity, particularly with reference to the Effect 

 of Height. By James D. Forbes, Esq., F.R.SS. L. 8^ Ed., Sfc, Pro- 

 fessor of Natural Philosophy in the University of Edinburgh, Page 



II On Paracyanogen and the Paracyanic Acid. By James F. W. John- 

 ston, A.M., F. R.S.Ed., Professor of Chemistry and Mineralogy m 



the University of Durham, 



Ill Experimental Researches into the Laws of Certain Hydrodynamical Phe- 

 nomena that accompany the Motion of Floating Bodies, and have not 

 previously been reduced into conformity with the known Laws of the Re- 

 sistance of Fluids. By John Scott Russell, Esq., M.A ., F.R.S.Ed. 47 

 IV. On the Action of Voltaic Electricity on Pyroxylic Spirit, and Solutions in 



Water, Alcohol, and Ether. By Aethur Connell, Esq., F.R.S.Ed. 110 



V. An Account of Three New Species of British Fishes, with some Remarks 

 on Twenty others new to the Coast of Scotland. By Richard Par- 

 NELL, M.D., F.R.S.Ed. Sfc IS'' 



VI. Accmnt of a New Species of British Bream, and of an Undescribed Spe- 



cies of Skate : To tohich is added a List of the Fishes of the Frith of 

 Forth, and its Trihitary Streams, with Observations. By Richard 

 Paenell, M.D., F.R.S.Ed. ^c 146 



VII. On the Power of tlie Periosteum to form New Bone. By James Syme, 



Esq., Professor of Clinical Surgery in the University of Edinburgh, . 158 



VIII On the Optical Figures produced by the Disintegrated Surfaces of Crystals. 



By Sir David Beewstee, K.H., D.C.L., V.P.R.S.Ed., F.R.S. . 164 



