Vll 



contents. 



(Part Second.) 



XV. On the Effects of Compression and Dilatation in al- 



tering the Polarising Structure of Doubly Re- 

 fracting Crystals. By David Brewster, LL. D. 

 F. B. S. Lond. & Edin. - - Page 281 



XVI. Experiments on Muriatic Acid Gas, with Observations 



on its Chemical Constitution, and on some other 

 Subjects of Chemical Theory. By John Murray, 

 M. D. F. B. S. Edin. - - 287 



XVII. Experiments on the Relation between Muriatic Acid 



and Chlorine ; to which is subjoined the Descrip- 

 tion of a New Instrument, for the Analysis of 

 Gases by Explosion. By Andrew Ure, M. D. 

 Professor of the Andersonian Institution, and 

 Member of the Geological Society, - 329 



XVIII. On the Laws which regulate the Distribution of the 



Polarising Force in Plates, Tubes, and Cylinders 

 of Glass, that have received the Polarising Struc- 

 ture. By David Brewster, LL. D. F. B. S. Lond. 

 and Edin. - - 353 



XIX. Remarks, illustrative of the Scope and Influence of 



the Philosophical Writings of Lord Bacon. By 

 Macvey Napier, Esq. F. R. S. Lond. , & Edin. 

 vnd F. A. S. Edin. - - 373 



XX. Sketch of the Geology of the Environs of Nice. By 



Thomas Allan, Esq. F. R. S. Edin. - - 427 



XXI. On certain Impressions of Cold transmitted from the 



Higher Atmosphere, with the Description of an 

 Instrument adapted to measure them. By John 

 Leslie, F. R. S. Edin. and Professor of Mathema- 

 tics in the University of Edinburgh. - - 465 



XX. 



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