200 DOMAIN X. TBANSILIENT. 



Malvern bills. The mineralogy of the Malvern hills, in Wor- 

 cestershire, also presents several imperfect rocks, 

 of the nature of granite, and chert, and wacken, 

 -with mica slate and schistose siderite. But this 

 intelligent writer's own description will convey 

 the clearest idea. He introduces it by the fol- 

 lowing observation, which indicates their proper 

 place in this division : " All these rocks fre- 

 quenily pass imperceptibly into each other; whence 

 arise various strange mixtures, and imperfectly 

 characterised fossils/' 



" These rocks are singularly blended together. 

 In some parts the granitoid rock, which contains 

 scarce any mica, runs as it were in thick irregu- 

 lar veins, or forms patches amongst the wacken 

 and chert ; and these likewise are similarly si- 

 tuated amongst the granite, sometimes the 

 one, sometimes the other, forming the principal 

 mass. 



" In walking over these hills, I collected the 

 following specimens; none of which I found 

 any where to constitute a considerable portion 

 of them, except the granitoid kind ; and this, 

 though greatly varying in its nature, I found in 

 considerable rocks on the summit of the ridge 

 between Great Malvern and the Well House. 



<c 1. Red granite, with scarce any silver mica, 

 and a little hornblende. 



