68 Proceedings of Royal Society of Edinburgh. [sess. 
likely to be obtained, his report and that of Dr Hind were held 
back. In November 1895 some further specimens were supplied 
by Dr John Murray, which he had received from Cape Adair, 
having been collected there by Mr C. E. Borchgrevink. These 
were also submitted to Mr Teall, who examined and described 
them. The publication of his notes, however, was still further 
delayed in the expectation that they would be capable of being 
extended by the receipt of another collection of specimens. As 
this hope has not yet been fulfilled, and as so much general 
interest is now felt in Antarctic exploration, it seems desirable to 
publish the following details without further delay. 
Petrographical Notes on Specimens from Dundee Island and 
Cape Adair, by J. J. H. Teall, E.R.S. 
1. Dundee Island. 
This collection contains several specimens of granite and vein- 
quartz, one of a dark green tuff, largely composed of felspars, and 
one of jasper. The largest specimen is an angular block of granite 
measuring 5" x 6" x 2". There are three other specimens of the 
same rock of considerable size, one of which has evidently been 
broken from a large mass, and nine small specimens of granite and 
vein-quartz, measuring about an inch across, and of approximately 
equal dimensions in the different directions. These, as well as the 
larger specimens, are either angular or sub-angular — never perfectly 
rounded, as they would have been if they had formed pebbles on 
a beach. There are no ice-marks on any of the specimens. 
The granites belong to two varieties — grey and pink. The 
essential constituents are oligoclase, orthoclase, biotite, and horn- 
blende. Zircon and iron-ores occur as accessory, epidote and 
chlorite as secondary constituents. In the grey granites idio- 
morphic crystals of wdiite felspar, often beautifully zoned, and 
occasionally showing the twinning and extinctions of oligoclase, 
form a considerable part of the entire mass. Biotite and horn- 
blende, both of which are more or less idiomorphic, also enter into 
the composition of the rock. The hornblende occurs sparingly, 
and may be either brown or green. One cross-section, showing the 
