Plate 12 



Photomicrographs by W. J. Miller 



Upper left figure. Part of slice of coarse granite from upper end of 

 gorge one-half of a mile south of Keene. All is sliced (or sheared) 

 and granulated quartz, except a little scattering ilmenite and microperthite. 

 Polarized light. Magnified 23 diameters. 



Upper right figure. Part of slice of syenite from roadside at southeastern 

 base of Cobble hill. Diallage crystal almost surrounded with a rim of 

 granulated hypersthene. Embedded in microperthite and quartz. Ordinary 

 light. Magnified 23 diameters. 



Lower left figure. Part of slice of rather gabbroid Whiteface anortho- 

 site from shore of river two-thirds of a mile southwest of Copperas pond. 

 Magnetite or ilmenite stirrounded with a rim of granulated garnet. Large 

 somewhat rounded prisms above and below are apatite. Large white areas 

 are mostly plagioclase. Ordinary light. Magnified 30 diameters. 



Lower right figure. Part of slice of Keene gneiss from i mile east- 

 northeast of Malcom pond. In the center, remarkable vermicular qtiartz 

 intergrown with plag'oclase. Ilmenite (black) above; orthoclase (gray) on 

 right ; plagioclase below ; and quartz and orthoclase on left. Polarized light. 

 Magnified 30 diameters. 



