222 The American Naturalist. (March, 
Doelter® describes a number of syntheses of rock forming minerals 
and a series of experiments relating to the influence of mineralizers 
in the production of rock components. The descriptions close with re- 
marks on the conclusions of petographic interest that may be deduced 
from the experiments. 
The same author’ declares as the result of microscopic and field stu- 
dies that the granite of the Bachergebirge is an intrusive rock although 
it possesses gneissoid features. On maps of the district a granite por- 
phyry is separated from the normal granite in coloring. This the 
author believes to be a mistake, as the two rocks are parts of the same 
magma. 
The Koralps” are composed of mica-schists, interlaminated with 
amphibolites, eklogites, marbles and gneissic pegmatites. The mica- 
schists are overlain by phyllites and green schists. The pegmatites are 
of three kinds—a schistose aggregate of large tourmalines and feld- 
spars, a granular aggregate of tourmaline, quartz and a little feldspar, 
and a massive quartz-rock containing a little tourmaline and feldspar. 
The amphibolites are in part garnetiferous. 
GEOLOGY AND PALEONTOLOGY. 
Rocks of the Antarctic Continent.—The rock specimens ob- 
tained by W. S. Bruce from floating ice and the stomach of Penguins 
in the Antarctic seas have been examined by Prof. Geikie, who makes 
the following report : 
The larger specimens are all basalt, and contain a good deal of olivine. 
The small fragments are also mostly basalt, with some tracbyte. A 
the specimens are what one finds upon the coasts of a region composed 
of igneous rocks. There was no trace of sedimentary or schistose rocks 
among the samples. 
The marine deposits obtained by Mr. Bruce off the eastern extremity 
of Joinville Island were determined by John Murray and Robert 
Irvine. The specimens came from depths of 130 to 235 fathoms. They 
consist of fragments of polyzoa, basaltic gravel, basaltic and quartz 
sand, and blue mud. The latter contains mineral particles, which indi- 
cate that on the adjoining land will be found true continental rocks. 
(Geog. Journ., 1896.) 
8 Neues Jahrb. f. Min., etc., 1897, I, p. 1. 
9 Mitth. des Naturw. v. f. Steiermark, 1894. 
10 Doelter, Ib., 1895. 
