a 
1020 The American Naturalist. [ December,. 
that these analyses are of commercially valuable clays, selected for 
their small alkali contents. In the course of his article the author cor- 
rects some of the statements made in earlier papers and amplifies 
others. He declares that newly formed feldspar is present in the slates 
metamorphosed‘ by the shap granite and in other contact slates. In 
the spots of the shap rocks, and in those of other contact slates, there 
is always present, in addition to its individual components, more or less 
of a yellowish-green very weakly polarizing substance in which the 
other components of the spot are imbedded. This is believed to pos- 
sess an indefinite composition, and to be the result of aqueo-fusion of 
some of the constituents of the original rock and the solidification of 
the product in an amorphous condition. The paper concludes with a 
statement of the author’s views concerning the transformations that. 
rutile, biotite, quartz, feldspar, cordierite and other contact minerals 
undergo in cases of contact metamorphism. 
The Phonolites of Northern Bohemia.—The phonolites of 
the Friedländer district of North Bohemia are nosean bearing trachy- 
tic phonolites and nepheline-phonolites, according to Blumrich? The 
latter contain phenocrysts of anorthoclase in a groundmass of sanidine, 
nepheline and aegerine crystals and groups of a new mineral which the: 
author calls hainite. This hainite is a strongly refracting but a weakly 
doubly refracting colorless substance. It occurs in tiny triclinic need- 
les with a density of 3.184. These unite into groups. It is found also 
as well-developed wine-yellow crystals forming druses in cavities in the 
rock. The mineral has a hardness of 5, and it is optically positive.. 
It is supposed to be closely related to rinkite, hjortdahlite and the other 
fluorine bearing silicates common to the eleolite-syenites. In addition 
to hainite the druse cavities contain albite, chabazite and nosean. In 
the trachytic phonolites a glassy base was detected. 
Spherulitic Granite in Sweden.—Loose blocks of spherical 
granite are reported by Backstróm* from Kortfors, in Orebro, and 
Balungstrand in Dalekarlien, Sweden. The rock from Kortfors is a 
hornblende granitite containing concentric nodules composed of four 
zones. e inner one consists of oligoclase, microcline and quartz ; 
the second of oligoclase in radial masses and small quantities of horn- 
blende, biotite, magnetite, orthoclase and quartz; the third of horn- 
blende, biotite, oligoclase and a little biotite, and the peripheral zone 
* Cf. American Naturalist, 1892, p. 245. 
5 Min. u. Petrog. Mitth., xiii, p. 465. 
* Geol. Foren. i. Stockh. Fórh. 16, p. 107. 
