200 Vrocecdiugs of the ^vciety of Arts. 



Tht> descriptions of the various inventions, &c. to be full and 

 distinctf and, when necessary, accompanied by SpecimenSy Draivings, 

 or Models. 



The Society shall be at hberty to publish in their Transactions 

 copies or abstracts of all Papers submitted to them. All Models, 

 Drawings, &c. for which Prizes shall be given, shall be held to be 

 the property of the Society, — the Society being in the practice of 

 taking the value of the Model into account in fixinor the amount of 

 the Prize. 



All Communications must be written on Foolscap paper, leaving 

 margins at least one inch broad, on both the outer and inner sides of 

 the page, so as to allow of their being afterwards bound up with 

 others ; and all Drawings must be on Imperial Drawing Paper, un- 

 less a larger sheet be requisite. 



All Communications to be lodged as soon after 1st November 1842 

 as possible^ in order to ensure their being read during the Session ; 

 but those which cannot be lodged so early, will be received till 1st 

 March 1843. 



Communications, Models, &c. to be addressed to James Tod, Esq., 

 the Secretary, 21 Dublin Street, Edinburgh, Postage or Carriage 

 paid. 



Copies of this List of Prizes may be had from the Secretary. 



Edinburgh, lltk April 1842. 



SCIENTIFIC INTELLIGENCE. 



GEOLOGY AND MINERALOGY. 



L On Fan-Shaped Stratification. — A distuiguished geologist in a let- 

 ter lately received says, — ''It would, without doubt, be making a great 

 step in geology, if we could explain the schistose structure and the stra- 

 tification of crystalline formations by means of the structure assumed 

 by ice. I believe that we are still far from being even at the com- 

 mencement as regards all those things which depend on molecular ac- 

 tions. The explanation, for example, given of the columnar structure 

 of basalts, has always appeared to be but little satisfactory ; and only 

 leads to a mode of accounting for a division of a somewhat different - 

 description. But the structure which has occupied me more than any 



