1867.] TIMINS — MALVEKN HILLS. 367 



LXXXY. Fragment from the border of the same rock, light, 

 porous, variegated, no crystallization. This border-rock has evi- 

 dently been altered. Parts of it are stained red by peroxide of iron 

 separated from the mass, occasionally forming plates of haematite, 

 which, being soluble in hydrochloric acid, are probably not due to 

 igneous action. They may have been produced, by double decom- 

 position, from chloride of iron and water, the hydrogen of the 

 water combining with the chlorine, and its oxygen with the pro- 

 toxide of iron, causing its peroxidation. In the harder portions of 

 the dyke, a few yards farther into the mass than LXXXIY., the 

 oxide of iron has been reduced, and separated as pyrites. 



LXXXVI. Erom a trap-dyke at the south-west base of Summer 

 Hill. Greyish black, imperfectly crystallized, contains pyrites. 

 G=2-873. Near the border, with lines of epidote, G=2-861 ; and 

 with peroxide of iron, G=2-887. 



LXXXVII. Near the border of a trap-dyke penetrating the rock 

 on the south side of the large quarry at West Malvern. Parts of it 

 are of a red colour, caused by anhydrous peroxide of iron ; the rest 

 is grey, reddish grey, and blackish grey ; it contains felspar of a 

 reddish colour, not distinctly crystallized. G=2-789-2'821. 



LXXXVIIT. Prom the middle trap-dyke in the terminal hill 

 between North and West Malvern. Hornblende, some felspar of a 

 pearly lustre, and a little glassy felspar, not distinctly crystallized. 

 G=2-955. In smaU veins, G=2-903. 



LXXXIX. Crystalline trap from the east side of North Hill. 

 Hornblende and yellowish felspar of no distinct cleavage. 



XC. Greyish black trap from the south slope of the North Hill, 

 not far from the border of a dyke. G=2'989. In the more crystal- 

 line parts of the same dyke, nearer the centre, G= 2-913. 



XCI. Prom the more central portion of the large trap-mass over- 

 looking Holly Mount. Hornblende crystals, of which a few are 

 acicular, and brownish uncrystallized felspar. G =2-912. 



XCII. Part of the same mass, nearer the border. Greyish black ; 

 no distinct crystallization. G=2-942. At an intermediate portion 

 of the same mass, G=2-932. 



XCIII. Dyke at Bartestree, altering the Old Eed Sandstone, 

 described by Professor PhiUips, loo. cit. p. 180. G=2-776. 



a. Portion soluble in cold distilled water slightly acidulated with 

 hydrochloric acid. 



h. The undissolved residue. 



C. Composition of the undissolved portion. 



XCIY. Dyke altering the Old Eed Sandstone, Brock HiU, Shelsey 

 Beauchamp. Phillips, loc. cit. p. 156. Hornblende was the predo- 

 minant mineral in the specimen analyzed. 



XCY. Trap from a dyke near Glynrhonwy, containing white fel- 

 spar, hornblende, and pyrites. 



XCYI. Trap traversing Mount Sorel granite. Greyish black ; un- 

 crystallized ; contains pyrites. 



XCYII. Eed felspathic trap, three quarters of a mile south of 



