O'Reilly — On the Ejndiorite and Mica Schists of KilUney. 25 

 !N"o. 76. I have made a minute and careful examination of this 



sample, and find it to eontain- 



SiOo, 



FeoOs, 



FeO, 



AI3O3, 



CaO, 



MgO, 



NiO, 



MnO, 



TiOo, 



Tungsten, 



K2O, 



NasO, 



Loss on ignition 



Per cent. 



58-102 

 3-522 

 4-086 



24-285 

 1-350 

 2-066 

 0-015 



Trace. 

 0-961 

 0-212 

 1-270 

 3-512 

 0-101 



100-082 



" In the special analysis for NiO and Tungsten, 100 grammes 

 of sample were acted upon. There are slight indications of 

 YaaOs heing present, hut in such minute quantities, that it 

 would be nearly impossible to make a rough guess at the 

 quantity, as when 200 grammes were acted upon, the colour- 

 test was applied, and even then the indication for VajOo were 

 not sure at all. 



(Signed), " W. S. Wahken." 



The presence of "WO3 was considered so interesting, that a portion 

 of the sample was submitted for examination to Mr. Hugh Ramage, 

 Assistant Chemist in the Laboratory of the Royal College of Science, 

 Dublin, and P.C.S., and he, after most careful and special testing for 

 Tungsten, was unable to detect any trace of it in the sample submitted 

 to him. Mr. Warren's analysis is, however, given as bearing on the 

 question of the relations of the rocks in Killiney Park one with the 

 other, and may be of interest as regards the mica schists of Bray 

 Head, to be yet examined. 



