148 Proceedings of the Royal Irish Academy. 



(7). Verp compact Crystalline Ifagnesian Limestone from Tawnagh, 

 Toormakeady, county Mayo. Associated vrith. upper Silurian rocks 

 and bedded igneous rocks. The blowpipe and subsequent wet analysis 

 showed the presence of zinc in small quantity. 



(8). Sornllende Schist from Inish-gloria Island, Belmullet, county 

 Mayo, gave small traces of zinc. 



(9). Sornhlende Eoch from Annagh Head, Belmullet. Blowpipe 

 examination proved this to contain zinc in very appreciable quantity, 

 confirmed by subsequent wet analysis. A little copper present. 



(10). Very pure Talc from county Galway. The blowpipe showed 

 considerable traces of zinc, and some of lead. Zinc very distinct. 



(11). BlacJc Mica from a vein in the summit of Liss-oughter, county 

 Galway. The blowpipe gave the usual indications of zinc very dis- 

 tinctly. Quite a number of spangles of zinc were reduced. "Wet 

 analysis confirmed its presence. Traces of copper and lead were also 

 obsei'ved. 



(12). OrtJwclase Felspar from a felstone porphyry, county Mayo. 

 The blowpipe gave faint indications of zinc. On reduction, a few tiny 

 spangles were obtained, which gave the usual zinc reactions. The 

 very small quantity of zinc present is thoroughly consistent with the 

 theory of its connexion with magnesium, since orthoclase contains 

 usually a very trifling amount of that metal. 



(13). Sornllendic Epidotic Roclc containing numerous radiated 

 nests of Actinolite or Tremolite, fi^om Cannaver Island, Lough Conib. 

 This rock is described by Mr. Kinahan as passing into serpentine 

 rocks.* The actinolite is almost infusible, and appears to be a highly 

 magnesian variety, ^"ith the blowpipe it gave abundant indications 

 of zinc. The mineral reduced with carbonate of soda yielded a large 

 quantity of spangles of metal easily soluble with evolution of hydi'o- 

 gen, in dilute hydi'ochloric acid. A wet analysis fully confirmed this. 

 Traces of copper and lead were also obseiwed. 



(14). A Serpentine Roclc from IS". "W. slope of Croagh Patrick, 

 county Mayo. In a compact base contains crystals of hornblende, and 

 layers of fibrous serpentine. The fibrous serpentine, reduced with 

 c-arbonate of soda, gave numerous spangles of zinc, which afforded the 

 usual zincic reactions. 



(15). Chlorite fi'om a granite fi'om Limehill, near Pomeroy, county 

 Tyi'one. Traces of zinc very distinct. 



(16). A dark grap>hitoidal steatitic Aryillite from county Mayo. 

 Examined with blowpipe. Indications of zinc distinct. 



(17). Very px^re greenish Steatite from county Mayo. The blowpipe 

 analysis of this yielded a large indication of zinc and nickel ; also traces 

 of lead. This specimen contained an estimatable quantity of nickel ; 

 and in order to be certain of the presence of zinc, which was rendered 



^ Ex. Mem Sheet 95, Geological Survey, Ireland, pp. 13 and 33. 



