Mr, Horner o« //^'tf Mineralogy of the Malvern Hills, 287 



compounds to which their terms are applied, and particularly those 

 in which theory is involved. They would thus be following a more 

 precise and more philosophical method, the accuracy of their obser- 

 vations would be more firmly relied on in the present day, and 

 there would be a greater probability of their proving valuable in a 

 more advanced state of the science. Those who have had an oppor- 

 tunity of seeing the various rocks to which the names grauwacke 

 and greenstone are applied, will perhaps agree with me in the opinion 

 I have thus ventured to advance. 



§ 11. Before proceeding to a detailed account of the several rocks 

 met with in the Malvern hills, I shall point out the general structure 

 of the great masses. The central part of the range, and nearly the 

 whole of the eastern side consist of the different compounds of fels- 

 par, hornblende, quartz, and mica, I have already alluded to. These 

 are irregularly heaped together in large masses, and in no part could 

 I discover them disposed in any way that could be considered as 

 continued stratification. In some instances, the materials of the rock 

 are so arranged as to give it a fissile appearance, and in these cases, the 

 slaty structure is either vertical or very highly inclined. But the 

 maoses themselves I never found to be of any great extent, and they 

 are frequently inclined to different points of the compass within a 

 very short space. Except in regard to the granite, I did not discover 

 any uniformity in the occurrence of any one compound in particular 

 situations, but all seem confusedly heaped together. The granite is 

 sometimes found in the highest parts of the hills, but chiefly prevails 

 in the lower parts, particularly towards the northern extremity, 

 either in large masses, or what is very frequent, forming veins which, 

 traverse the other rocks. These veins or shoots are for the most part 

 narrow, and, as far as 1 had an opportunity of ascertaining, they ge- 

 nerally become more so, the higher they ascend. 



