SO-CALLED PORPAVAITIC GNEISS OF NEW HAMPSHIRE 795 
have been employed. It seems best to use the original name at 
first used by each of the New Hampshire surveys and in this we 
follow the nomenclature of Lehmann, Sederholm, Giimbel and 
others who have dealt with very similar rocks. 
Fic. 2.— Photograph of a specimen of the porphyritic granite, showing a foliated 
phase near Hancock Station. The lowest phenocryst displays two prismatic partings 
besides the normal cleavages, parallel to Pand JZ. The base is nearly in the plane 
of the paper. About one-half natural size. 
The granite is always striking and handsome in appearance 
The groundmass is a coarse-grained, light to dark gray, granular 
aggregate of quartzand feldspar interspersed with flecks, blotches 
and lines of greenish muscovite and brilliant brown biotite. 
