CONTENTS. 



PART I. 



/n 



I. Account of some Eocperiments made in Different Parts of Europe^ on 

 Terrestrial Magnetic Intensity, particularly with reference to the Effect 

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

 fessor of Natural Philosophy in the University of Edinburgh, Page 1 



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

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

 the University of Durham, ........ 80 



III. Experimental Researches into the Laws of Certain Hydrodynamical Phe- 



nomena that accomp)any 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 Arthur 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. 8fc 187 



VI. Account of a Neiv Species of British Bream, and of an Undescribed Spe- 

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

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

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



VII. On the Power of the 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 Brewster, K.H., D.C.L., V. P. R.S.Ed., F.R.S. . 164 



