486 T. W. E. DAVID, W. F. SMEETH, AND J. A. SCHOFIELD. 
colour. Numerous small brownish-red olivines are present as 
well as minute crystals and grains of a pale augite, and much 
magnetite dust, The glass contains numerous globulites and 
microlites, but nothing of special interest. 
Basalt, (Nos. 3 and 7.) 
These specimens seem identical, save that No. 3 is slightly 
vesicular, while No. 7 is fairly compact. Colour greyish-black. 
Base glassy with patches of finely granular augite. Small lath- 
shaped felspars abundant, also small brownish-red olivines. Por- 
phyritic constituents scanty, consisting of one or two rich brown 
hornblendes surrounded by a considerable resorption layer of 
opacite granules mixed with granules of augitic material ; and a 
few fair sized grains of a greenish augite. These specimens beat 
a strong resemblance to Nos. 1 and 2 in mineralogical constitution. 
Basalt, (No. 5.) 
Fine in texture with glassy base containing magnetite, minute 
pale augite, felspar microliths, and some small olivines decompo> 
ing into brownish-yellow serpentine. The usual small lath-shaped 
felspars are present ; some porphyritic grains of pale augite, and 
some pseudomorphs of hornblende in opacite and augite granules. 
One of these represents a large crystal of hornblende, and some 
of the original mineral remains. This is clear and fresh, and 
shows a greenish-yellow to brown pleochrism (Plate 15; fig. 1). 
Near the centre of the pseudomorph a large patch of the rock 
base isincluded. The constitution of this pseudomorph is peculiar. 
There is an outer zone of opacite, and almost colourless augite 
granules preserving the idiomorphic outline of the original horn- 
blende. Inside this there is a zone of varying width formed of 
fucoid-like growths standing at right-angles to the sides. 
are dark brown in colour, translucent, and slightly pleochroie ()) 
and apparently traversed by strings of opacite granules. be 
probable that they consist of thin leaves of a brown oxide of ir0s 
Basalt, (No. 6). : 
Fine in texture, with glassy base nearly colourless and contall: 
ing numerous globulites and grains of highly refracting materi 
