20 Pentti Eskola. = (LX OSA 
albite. The quartz is not abundant, while hornblende and = 
biotite are present in conspicuous amounts. Such hornblende- SS 
biotite-granodiorites were observed by the writer e.g. at SA 
Mys Pokoyniky and at Irkana; in the neighbourhood of Mys — - 
Besimyanniy it is widely distributed. Mr. Viscont collected = 
from point 163B a specimen of hornblende-granodiorite 
having small amounts of quartz and a plagioclase that Sd 
contains only about 70 percent albite. 
Here and there the granodiorite passes by gradual Rn 
tion into more femic types, which, however, do not occupy 
any large areas, but are rather like inclusions. Similar rocks : 
are seen near the contacts with the limestones and gneisses. 
Apparently some of the dioritic or gabbroid intrusive rocks 
met with in the migmatitic area also are in a comagmatie = - 
relation to the prophyritic coarse-grained granodiorites. 
The gradual transition of the normal granodiorite into EE 
more femic types takes place by means of increase in the 
amount of hornblende, the composition of the plagioclase 
being little affected. Thus, a specimen of a hornblenditic 
rock from Mys Monachoff consists chiefly of green horn- 
blende and contains a little plagioclase, microcline and Sd 
quartz. The refractive indices of the plagioclase are all = 
lower than w of the quartz and the feldspar cannot, there- 
fore, contain more than about 15 percent anorthite. 
Porphyritic coarse-grained granite. 
The varieties more femic than the main type being 
quantitatively of little importance, more salic types of a 
the coarse-grained porphyritic rocks occupy large portions 
of the great batholith. Greater part of them are true grani- = 
tes, the alkali-feldspar exceeding largely the lime-soda-feld- = - 
spar. At the same time the Körner often though not = 
always disappears. 
Specimens of such granites were collected from point. 
156 A, from Mys Pokoyniky and from the island of Baklani. 
The distribution of the granitic and granodioritic portions 
of the batholith does not show any regularity. Both types 2 
