220 Scientific Proceedings, Royal Dublin Society. 
ore in depth increasing in size and quality. The second is 6 fms. 
farther north, and in the south shaft (Madam Butler’s) it was 2 feet 
wide, yielding chalcopyrite in a gangue of quartz with chlorite. 
Five fms. still farther north is the third, or Madam Butler’s vein, 
and in the north shaft it was 2 feet wide, yielding chalcopyrite with 
a gangcue of kilmacooite. This vein was worked for copper by the 
“old men;” but on account of the kilmacooite it is doubtful if 
they were able to dress the ore to a profit. Two fathoms north of 
Madam Butler’s shaft the fourth lode occurs, where it is 2 fms. 
wide, and composed of soft dark killas with specks and strings 
of iron pyrites ; while 8 fms. to the north of the latter there is a 
second vein of soft killas containing iron pyrites and a little 
chalcopyrite. This vein was driven on in search of copper by 
the “old men,” but was not found profitable. 
These five lodes occur in the felspathic country rocks (ash or 
tuffs), while immediately north of the fifth or north lode, hornstone 
comes in, and a little farther north a protrusion of felstone ; but 
about sixteen fms. westward of the Lodge level there is a fault 
bearing about N. 25° W., which cuts out the hornstone and fel- 
stone, and brings in the country rock. The effect of this fault 
on these five lodes is unknown ; but probably it cuts off the pre- 
viously mentioned Magpie south lode. 
This felstone contains a very large per-centage of iron pyrites, 
while there is scarcely any in the hornstone. The latter has a 
similar underlie to the country rock, and southward seems to 
graduate into it. 
The south lode of the Magpie, at the Old Whim shaft, as seen 
in the Lodge level, is nearly entirely filled with whitish felspathic 
clay. It is lke decomposed felstone, and occurs in every 
stage from a hard stone to fine clay. As this lode is followed 
eastward it separates from the main lode, and at the N. 32° E. 
head there is a thickness of 32 fms. of killas between them. The N. 
32° K. head cuts off the south lode, but the north lode, as pre- 
viously mentioned, turns along it towards the N.E, for about 100 
fms., when it again turns and takes its normal bearing, N. 60° E. 
In this head (N. 32° E.) the felstone forms the hanging wall of 
the lode, while its filling stuff is nearly entirely white felspathic 
clay, instead of the “blue steatitic clay,” which up to this place 
formed the principal filling stuff The chief ore in this part of 
