The American Geologist, Vm.. XXVII. 
Plate XXI. 
Plate XXI. Figure i. Photomicrograph of pori'hvritic granite 
TEN MILES south OF GREEXESr.ORO, GrEENE COUNTY, GEORGIA. CROSSED 
NICOLS X74. 
Plate XXT. Figure 2. Photomicrograph of porphyritic granite 
NEAR Coweta Station, Coweta coi'nty, Georgia. Crossed nicols 
X74. 
