44 Prare VII. A. Microphotograph of polished ore from the Brian Boru property, magnified 395 diameters. Chalco- pyrite veining zine blende. 1, zine blende; 2, chaleo- pyrite; 8, pyrrhotite; 4, gangue. Paragenesis—4, (Page 20.) So. 2. B. Microphotograph of polished ore from the Hazelton View mine, magnified 395 diameters. Show- ing the fineness and distribution of the gold. 1, arsenopyrite; 2, safflorite; 3, gold; 4, molybdenite; 5, gangue (quartz, actinolite, etc.). (Page 23.)