98 Rev. R. Ashington Bullen—MHolian Deposits at Etel. 
Pl. X, Fig. 2, is much coarser in texture, the quartz-grains, which 
are extremely irregular in shape, varying very considerably in 
dimensions. The interlocking of the grains is striking, but foliation 
is not evident. Strain polarization effects are well shown, especially 
in the larger individuals. Small streaks and patches of brown 
material occur, as in Fig. 1, and a shght film of it envelops each 
quartz-grain. Minute inclusions, probably of liquid or gaseous matter, 
are abundant in the quartz, and in places occur in long series, 
continuous through adjacent crystals. 
In Pl. X, Fig. 3, the foliation is again seen to be distinct, and the 
quartz-grains are fairly uniform in size: a sort of groundwork of smaller 
grains has, scattered through it, elongated crystals of much greater 
dimensions, but agreeing approximately in size with one another. 
Many of the crystals, both of the smaller and the larger size, are 
fairly regular in contour, being three or four times as long as they 
are wide. Undulatory extinction is common, inclusions are quite rare, 
while the brown-red indefinite staining material is very abundant, 
and has the characters of hematite in places. 
Pl. X, Fig. 4, is coarser in texture than any of the others. All the 
grains are large and most of them elongated, so that the foliation is 
well seen. Inclusions are not abundant, but in places occur in 
series, especially along lines of apparently incipient fracture. The 
brown-red colouring matter is fairly abundant, and a very lttle mica 
is suggested here and there. Undulatory extinction is again noticeable. 
Pl. X, Fig.5. In structure this rock is holocrystalline, hypidiomorphic, 
without porphyritic constituents; its texture is of medium coarseness. 
The specimen is somewhat decomposed, as is shown by the partial 
kaolinization of felspars, while there is a decided tendency for the 
individual crystals to separate from one another to produce an angular 
sand. In mass the rock is very pale in colour, and white mica, 
felspar, and quartz are easily recognizable; the few dark streaky 
patches seen by the naked eye are found by microscopic examination 
to be biotite. Under the microscope j/elspars are seen to be most 
abundant, the other essential constituents being quartz, muscovite, and 
brotite. The two micas are, in several instances, in parallel growth, 
while the contours of the various crystals show that the micas have 
usually preceded the felspars, and the quartz has succeeded them in 
order of crystallization. The felspars are invariably kaolinized, but 
not to a great extent. In some cases an outer zone of nearly fresh 
felspar surrounds a kaolinized kernel. The simple twinning of ortho- 
clase is seen in numerous crystals, while others are striated. Some 
of these plagioclases show simple twinning together with twinning on 
the albite law, while a very few exhibit the cross-hatching due to 
albite with pericline twinning: these latter may be considered as 
microcline. A number of observations of extinctions in plagioclases 
exhibiting albite twinning gave low readings (5°-12°); thus these 
are oligoclase-andesine. The quartz is clear, with a few minute 
inclusions, and is mostly quite allotriomorphic. The micas are 
abundant, well-shaped, and usually associated in parallel growth. 
The muscovite is quite clear and colourless, while the biotite is of 
a greenish-brown colour with moderately strong pleochroism: its 
