185 
I. Gneissic granite, hills near King's Bluff, Olary, Б.А. 
(calculated). 
“TI. Granite, Chywoon, Morvah, Cornwall (Teall: British 
Petrography, 1888, p. 314). 
III. Granite, Wilson's Creek, Omeo, Victoria (Howitt: 
Trans. Roy. Soc. Vic., vol. xxiv., 1888, p. 122). 
The calculation of the norm leads to the following result: — 
Per Cent. 
СУЛАРЫ soda cdi nacre qoid ies. 26°04 
Orthoclase  . øsende as E og 38:36 
А ево. вуд aot. Lerum 94:63 
Сога ага. a adera idin birt ab 449 
уре опен mdi 120-4542 ot 2:76 
Magnetite Dha al... bastion 2:32 
Ilmenite HERTA NO ant ан 46 
Total со. ae 99:06 
The rock, therefore, belongs to Class I. Persalane, Order 2 
Britannare, Rang. 1 Liparose, Subrang. 3. Liparose. 
It is certain that a chemical analysis would show 
that some of the soda should be replaced by lime. A lower- 
ing of the soda by '75 per cent. would bring the rock under 
consideration into Subrang. 2 (Omeose), of which the granite 
from Wilson's Creek, Victoria (Analysis III. above) is the 
type. 
GNEISSIC GRANITE (в) FROM HILLS NEAR KING'S BLUFF. 
Macroscopic Characters.—In hand specimen the rock is 
light pinkish-grey in colour, speckled with black, and ex- 
hibiting silvery-white patches. The texture is holocrystalline, 
moderately fine, and the rock is roughly foliated. On ex- 
amination with a lens, pink and white felspars are seen to be 
abundant, but striation of the felspar is not apparent. 
Abundant interstitial, milky quartz is present. The black 
material is biotite, the silvery mineral is muscovite, the two 
micas being about equally abundant. The muscovite is in 
larger flakes than the biotite and exhibits very markedly the 
phenomenon of lustre mottling. Additional evidence of strain 
is afforded by the occurrence of rough joints and by the de- 
velopment on them of secondary mica, both muscovite and 
biotite. 
Microscopic Characters.—In section the rock is hy- 
pidiomorphie granular in texture. The foliation which 
is so marked a feature macroscopically is just as important 
under the microscope. In addition to the bending the indi- 
