DESCRIPTION OF THE PLATE. 
Reproduced by the artotype process from a micro-photograph taken with polar- 
izer only. The enlargement is 23 diameters. 
The plate shows an augite phenocryst having a border of secondary augite and 
enclosing a resorbed grain of hornblende of the first generation. A portion of a 
resorbed hornblende crystal of the second generation is also shown. Some of the 
larger augite crystals of the groundmass are distinguishable. 
