HUTTONIAN THEORY. 



the characters of which are next to be exami 

 hed. 



The terra whin, or whinjione, with Dr Hut 

 ton, like the word trap, with the German mine 

 ralogifts, denotes a clafs of ftones, comprehend- 

 ing feveral difiind fpecies, or at leall varieties. 



f" 



The common bafalt, the wacken, midlen, and 

 crag of Kirwan, the grilnjlein oi Werner, and 



r 



amygdaloid, are comprehended under the 



the ai 



name of whin. All thefe Hones ha^ 



a ten- 



dency to a fpathofe- ftrud 



leaft 



e 



diments of 



yflal 



r 



and difcover at 

 ization. They 



wi 



any mar 



as 



are, at the fame time, 



Gratification in their internal 



are alfo, for the moft part, in their outward 



figuration ; ahd, as the different 



enumerated compofe, no 



the fame continiious rock, th 



k of 

 they 



here 



frequently, part's of 

 i change from one 



to another being made through a feries of 



fenfible gradations, they may fafely be 



gard 



ed by the geologift as belonging to the fame 



genus 



62. Whin, though not ftratified, exifts in t 

 different ways, that is, either in veins, (called 

 Scotland dykes), trave 



already defcribed 



fing the ft 



or in 



incumbent c 

 pofed betwe 



^vhinftone h 



the ftr 

 them 



rata like the 



gular maffes, 



and fometimes inter- 



r 



In both thefe forms, 

 ly the fame characters, and 



bears 



£j 



n 



9 



