The American C.eoi-ogist. Vol. XXVII. 
Plate XXII. 
Plate XXII. Figure i. Photomicrograph of the Lithonia contort- 
ed BIOTITE granite-gneiss NEAR LiTHONIA, DeKaLB COUNTy, GEORGIA. 
Crossed nicols X74. 
Plate XXII. Figure 2. Photomicrograph of a fine-grained d.\rk- 
BLUE BIOTITE GRANITE FROM A DIKE FORTY FEET WIDE, CUTTING THE 
PORPHYRITIC .GRANITE-GNEISS, NEAR CaMAK, WaRREN COUNTY 
Georgia. Crossed nicols X74. 
