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1894.] Petrography. 705 
The tuffs found with the nepheline leucite basalts of the Dauner 
region in the Eifel are made up of augite, mica, and olivine fragments, 
augite crystals, glass particles and lapilli cemented together by quartz 
and felspar which represent an original glassy cement." 
On the west coast of the Island of Celebes, Wichmann” finds boul- 
ders of an epidote glaucophane-mica schist, supposed to be associated 
somewhere in the interior of the island with mica quartzite. 
JI, Schulte: Verh. d. Naturh. Ver. Bonn., 1893, p. 295. 
!'Neues Jahrb. f. Min. etc., 1893, LI, p. 176. 
