Explanation of Plate IV. ( Pliotoinierogi-aphs) 



Fig. 1. Dioi'ite injlouite. Loc. — Eastern eutranee of the Mjojin timnel. 

 Niçois crossed. Magnified 60 diameters. F, plagioclase m^ionitized along 

 the margin ; M, cataclastic grains of xJagioclase. 



Fig. 2. Gabbroid cliorite. Loc. — Near the entrance of the Sekiei adit. Or- 

 dinary light. Magnified GO diameters. F, entirely kaolinized feldspar ; 

 H, hornblende. 



Fig. 3. Akenobeite. Loc. — Higashiyama, Akénolié. Ordinär}^ light. Magni- 

 fied 60 diameters. F, feldspar (orthoclase and oligoclase) ; Q, grannlar 

 quartz. 



Fig. 4. Ditto bet\\een crossed niçois. 



Fig. 5. Altered gabbroid diorite, exposed near the entrance of the Sekiei 

 adit. Ordinary light. Magnified 60 diameters. H, hornblende partially 

 altered to a fibrous actinolitic yariety ; F, entirely kaolinized feldspar 

 with irregular boundaries. 



Fig. 6. Schistose diorite. Loc. — Mikobata Pass. Ordinary light. 3,laguified 

 60 diameters. H, hornblende ; F, felds^^ar, granulated and mingled ^\ ith 

 sericite fibers; P, pp-rhotite. 



