PUBLICATIONS. 109 
Considered separately the author reaches the following conclusions : 
1. Variolitic granite from Altai, Siberia (new locality). 
The chemical and mineralogical compositions of the granite 
magma, the core and the shells of the varioles are such that they show 
that here is an endogenous contact formation, since the core is more 
basic and does not belong to the granite magma. Judging from the 
‘zircons* the core “‘is the last remnant of an inclusion of the nature of 
biotite-gneiss resorbed by the granite.” Further, ‘as when a crystal 
of a salt is suspended in a saturated solution of salts the salt, like the 
crystal, is the first precipitated. and then the others, so if orthoclase 
were caught up in the magma the orthoclase of the magma would 
crystallize first, then the isomorphous plagioclase.” By this time the 
feldspar exerts only a directing influence, so that the biotite crystallizes 
and is oriented with regard to the feldspar interior. 
2. Wariolitic amphibole-granite from Rattlesnake Bar, California.’ 
The dark green rock which contains the spheroids consists of a 
granular mass of cloudy gray feldspar, pellucid quartz, and abundant 
brownish green hornblende. The varioles are more or less regular 
ellipsoids with diameters of 8 cm., 5 cm., 6.5 cm. respectively, and repre- 
sent basic inclusions of a foreign rock, or a more basic primary secre- 
tion from the amphibole-granite magma, which have been resorbed in 
part by the magma. As the cooling, pressure, water contents, etc., 
changed, a new crystallization took place about the included remnant 
forming a concentric layer of minerals produced from the preéxisting 
magma saturated with the included substance. This action continued 
until the circumstances existing in ordinary granitic formations had 
gained the upper hand. 
The spheroidal form tends towards a more rapid crystallization, 
and so the secretion of concentric layers follows more rapidly than the 
individualization of the surrounding granitic magma. From the 
already formed core go out certain directing influences so that the 
amphibole, the ores, and part of the feldspar force themselves into a 
radial arrangement. 
3. Variolitic granite from Kunnersdorf, Silesia (new locality). 
The granite mass, in which the 8-15 cm., rounded to angular 
spheroids he, consists of reddish gray, medium fine-grained feldspar, 
t Vid. CHRUSTSCHOFF, Zur Kenntniss der Zirkone in Gesteine. Tschermak’s Min. 
und Petr. Mitth. Bd. XIL., p. 423. 
2Vom RATH: Sitzungber. d. niederrh. Ges., December, 1884. 
