PETROLOGICAL ABSTRACTS AND REVIEWS 85 



diameter, printed on thick, transparent celluloid, and with curves at 1° intervals. 

 The celluloid disk rests on the glass disk and by means of centering screws can 

 be centered to the axis of rotation of an outer steel ring which carries the tracing 

 paper on which measurements are plotted. An accuracy of 0.1° is attainable. 



WuRM, Clementine. "Die Mineralien in den Einschliissen des 

 Basaltes vom Finkenberg bei Beuel," Centralbl. f. Min. etc., 

 1921, 581-90. 



Describes all the minerals found in inclusions of basalt from the Finken- 

 berg region, and discusses their origin and genetic relationships. 



Zantini, Willy. "Der Noseanphonolith des Schnellkopfs bei 

 Brenk und die anstehenden Noseanphonolithe iiberhaupt mit 

 besonderer Beriicksichtigung ihres geologischen Auftretens 

 und ihrer Einschliisse," Neues Jahrh., B. B. XXXVIII (1914), 

 587-642, pis. 2. 



Underlying the Laacher Sea there was evidently a foyaitic magma which 

 solidified at depth as a plutonic rock and its accompanying dikes, and now 

 expressed by numerous inclusions in the extrusives, and in an extrusive nose- 

 anite phonolite and its tuff. This extrusive is here described in considerable 

 detail, with analyses and descriptions of the component minerals. 



