508 
Proceedings of the Royal Irish Academy. 
a dark grey. On the fresh surface of fracture of the specimen exa- 
mined, hydrochloric acid produces a distinct effervescence, showing 
the presence of lime carbonate, apparently due to the alteration of 
some of the lime silicates present. 
S N 
SOL'TH-NORTH SECTION OF SERPENTINE BeD ON OLD EoADWAY ABOUT 100 YDS. S. 
OP THE WiNDGATE QuARTZITE. 
1 . Grit Bed. 
2. ,, 33 ins. 
3. Coarse green Slate, 11 in. 
4. Grit, 20 ins. 
5. Serpentine passing into 6 (same 
as 3). 
6. Coarse green Slate, 6 ins. 
7. Grit, 23 ins. 
8. Foliated or laminated hard Slate, 
showing wavy Hnes of folia- 
tion, 21 ins. 
9. Grit, 24 ins. 
Direction of Serpentine bed, N. 61° E. Dip, N. 56°. 
Thickness of 5 and 6, 8 feet. 
The chemical analysis of a specimen taken from the railway 
cutting was made by Miss M. W. Eobertson, M. A., R. Tin. Ir., and 
her Eeport thereof is as follows : — 
I have examined the green-speckled rock, JN'o. 29, which you 
submitted to me for analysis, and find that it contains the following 
substances : — silica ; iron, present as PeO ; alumina ; magnesia ; lime ; 
and carbonic acid ; also minute quantities of copper, nickel, and chro- 
mium ; an exceedingly faint trace of cobalt and manganese. The 
alkalies, soda, potash, and lithia, are also present, but in very small 
qumtity. The body fuses on being heated over the blowpipe. 
