756 THE AMERICAN NATURALIST, (VoL. XXXIII. 
testing of building stones, of the museums and collections of minerals 
and rocks within the limits of the kingdom, and of articles in the 
geology of Saxony. W.S.B. 
Notes. — The lavas of the early Tertiary volcanoes’ of the Absaroka 
range on the east side of the Yellowstone National Park consist 
of a repeated succession of hornblendic and micaceous andesites, 
basalts, pyroxene, andesites, and finally a series of great flows of 
basalts. With these are associated immense deposits of tuffs, 
agglomerates, and igneous conglomerates. 
Cushing ? describes the augite-syenite gneiss near Loon Lake in the 
Adirondack district, New York, as medium grained, grayish green 
rocks composed of feldspar, pyroxene or hornblende, quartz, and some- 
times biotite or garnet. They are undoubtedly metamorphosed intru- 
sive rocks that are intimately associated with gneisses of sedimentary 
origin. The feldspar is usually a microperthite, but there are usu- 
ally present in all slides small quantities of oligoclase. The pyroxene 
is principally augite, but hypersthene is often associated with it. 
The quartz is in elongated cylindrical individuals. The rocks are 
autoclastic in structure and are also foliated. In composition they 
are close to akerite. 
SiO, TiO, Al.O; Fe,03 FeO CaO BaO MgO K,O Na,O P20; Loss Tot. 
63.45 07 15.31... 42 $66 2.03 -13. 35 $15 $00. t: 30 = 99.73 
It is plain from the analysis that the augite is essentially a calcium, 
ferrous, aluminous variety unusually rich in alumina. The micro- 
perthite is approximately ‚Or, AC,;. The syenite is thought to be 
closely related in origin to the anorthesite of the district. 
Baalow * gives excellent descriptions of some of the handsome 
autoclastic conglomerates met with in the Grenville and Hastings 
series of Ontario. They resemble very closely true conglomerates, 
but their genesis from banded rocks by dynamic agencies is clearly 
traced. The illustrations accompanying the descriptions are partic- 
ularly interesting. 
Pirssow * collected together in a few pages the evidence that points 
to the conclusions that the phenocrysts of intrusive rocks are often 
formed in place, and are not intratelluric. The reasons for this con- 
1 Presidential Address of Arnold Hague, Geol. Soc. of Washington, 1899- 
2 Bull. Geol. Soc. of America, vol. x, p. 177. 
3 Ottawa Naturalist, vol. xii, p. 205, 1899. 
4 Amer. Jour. Sci., vol. vii, p. 271, 1899. 
