490 T. W. E. DAVID, W. F. SMEETH, AND J. A. SCHOFIELD. 
prismatic cleavages of the hornblende, and here the hornblende 
and augite extinguish simultaneously. 
The dark brown to opaque inclusions do not occur in the 
original hornblende, but are confined to the surrounding altered 
portion. They do not appear to have any very definite arrange- 
ment, irregularly elongated and platy forms being common. On 
the edges, and when in thin films, they are translucent and of a 
dark brown colour. Associated with these are prisms and irregular 
patches of brownish-yellow olivine ; and in some cases a layer of 
this olivine appears to fringe some of the brown inclusions, and 
one material seems even to pass gradually into the other (Plate 13 
fig. 7.) It is a suggestion perhaps worth making that this dark 
material is silicate of iron allied to ilvaite, which would resemble 
a fayalite in which some of the iron was peroxidised. The trans- 
ition from this to a ferrugineous olivine, or vice versa, is easily 
conceivable. 
Nos. 11 and 13 are: fragments of basic scorie, varying from 
black to red in colour. Some are very highly vesicular and may 
be intermediate in composition. No. 11 is more compact and 
most of the vesicles are lined with zeolitic material. 
SUMMARY. 
The collections submitted to us by Mr. Borchgrevink, in addi- 
tion to proving the existence in Victoria Land of a group of 
trachyte lavas containing soda-augites, and other interesting rocks 
such as the ultra-basic limburgites and the mica-schist already 
described, appear to us to strongly confirm the conclusion already 
arrived at by Dr. Murray and several eminent biologists a8 
the existence within the Antarctic Circle of an Antarctic Con 
tinent rather than an Antarctic Archipelago. The schistose and 
granitic rocks collected by him at Cape Adare are distinctly of 
continental origin, and imply a strong probability of the com 
tinuity of Victoria Land with Adélie Land. 
In speaking of Mr. Borchgrevink’s work we can but echo the 
sentiments already expressed by Dr. Murray, that it is imposs 
