Geology.] 



SUBANTARCTIC ISLANDS OF NEW ZEALAND. 



(193 



Fig. 8. — Gabbko, Mount Menhir, Campbell Island. 



Micro, section, magnified 2-5 diameters, between crossed 

 nicols. 



Fig. 9. 



-Micro. Section of Dolerite, Summit of Mount 

 Dumas, Campbell Island. 



Magnified 25 diameters, between crossed nicols. 



Fig. 10. — Micro. Section of Porphyry fboji Lower Slopes 

 OF Mount Dumas, Campbell Isl.and. 



Magnified 2-5 diameters, between crossed nicols. 



The large crystal is anorthoclase ; the groundmass feldspar 

 microlites in isotropic matter. 



Fig. 11. — Trachyte with Orthophyric Structuhe from Lower 

 Slopes of Mount Eboule, Campbell Island. 



The lightest crystal anorthoclase, the darkest aegerine- 

 augite, and the third augite. 



