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EDSON S. BASTIN 



occurs in a few places in aggregates of small grains associated with 

 similar grains of orthoclase, and both grading into the perthitic 

 intergrowths. It also occurs occasionally in small subangular 

 grains inclosed in the large feldspar crystals. Most of the feldspar 

 phenocrysts are full of inclusions. Some are dotted with subangu- 

 lar or rounded inclusions of quartz, and sometimes of orthoclase 



Fig. I. — Prowersose from Knox County, Maine. Natural size. 



and albite, in grains averaging about y^ of a millimeter in diameter; 

 quartz thus included makes up perhaps 2 per cent, of the pheno- 

 crysts. Minute prisms of zircon are also of common occurrence. 

 The most abundant inclusions appear hairlike under the low-power, 

 but under the high-power are seen to consist of large numbers of 

 minute, brownish, globular bodies arranged close together in per- 

 fectly straight lines. Some of these lines of globules are a millimeter 

 in length. In a few cases the globules are seen to increase in length, 

 so that they form a row of short prisms arranged end to end; these 



