Appendix. 325 
the vesicular and glassy surface of the lava-flow. Only a few 
specimens show porphyritic crystals, which consist of small augites 
and olivines, with very little felspar. A large mass of basalt from 
Franklin Island is remarkable for the number and large size of 
the olivine-nodules, such as occur, eg, in many of the tertiary 
basalts of Rhenish Prussia. 
Some of the basalts contain hornblende, and are similar to the 
 glassy hornblende basalt from Possession Island, in the Ross 
Collection. 
Of fragmental basaltic rocks, there are specimens of palagonite 
tuff, and of an agglomerate, consisting of large angular fragments 
of basalt bound together by a red calcareous cement. 
Of volcanic rocks besides basalts, the collection contains one 
or two rounded fragments of dark phonolitic rocks, which present 
characters strikingly similar to phonolitic rocks from the Canary 
Islands and from the Rift Valley in the neighbourhood of McKenya, 
East Africa. 
The pale-green slate from Duke of York Island, of which a 
large number of specimens was collected, contains much iron- 
pyrites and is traversed by quartz veins. Probably connected 
with the slate are specimens of a pale-green fine grained quartz-grit. 
Of the granitic boulders, one specimen is remarkable for the 
large size of the porphyritic felspar crystals, which measure as 
much as 2 ins. long by 3 іп. broad. А large specimen from 
Possession Island, showing pegmatitic structure, and containing 
muscovite and pink garnets, is similar to a specimen in the Ross 
Collection. It is probably a dyke rock, belonging to the Aplite- 
pegmatite group. 
Possibly in connection with these granites are specimens of 
pale hornstone-like felsites, some of which contain small phenocrysts 
of felspar and muscovite, while others are hálleflinta-like, without 
porphyritic constituents. 
е 1% IPIRMOIR. 
Min. Dep., Nov. 30th, 1900. 
