Dr. Berger on the Isle of Man. 49 



fracture is vitreous, but sometimes displays a sort of lamellar tex- 

 ture. The crystallized garnets are much less fusible than the basi"? 

 or massive garnet : the latter passes into a brownish bead. There 

 are besides in one of the specimens some nodules of radiated zeolite 

 or mesotype. In another the mass of garnet is blended with white 

 felspar. 



At B. Wodden I noticed a large block of granular quartz with 

 garnets ? and hornblende. The rock has a greenish-grey colour. 

 The fracture in the small is granular scaly. Another rock, related 

 to the preceding, is amongst the Druidical stones of KirkBallaugh. 



(^) Transition-rocks not in Situ, 



•|- Greyzvacke. 



Between Ramsay and Aire-Point I saw in some heaps of stones 

 a number of pieces and blocks of greywacke, passing from large 

 grained into a small grained texture. The basis is greyish, the im- 

 bedded fragments are mostly nodules of white quartz with scraps 

 of a dull and black sort of slate, fusible into a whitish enamel, and 

 abraded plates or broad spangles of mica. The cavities that receive 

 the nodules of quartz when freed from them, appear smooth and 

 even. The pieces of slate turn sometimes clayey, micaceous, and 

 of a brown ferruginous colour. 



[c] Flcetz-Rocks, 

 •f- Limestone. 



I shall merely speak here of some water-worn limestone pebble* 

 found in great plenty from Kirk-michael to Jurby point, though 

 no solid strata of this kind can be seen in situ* They are picked 



Vol. II. s 



