Trans. N.Z. Inst., Vol. XXXIV. 



Pl. XXIV. 



C. 

 Fragment in Grit from the Horn, Manueau Harbour. 



Magnified 50 Diameters. 



Augite crystals 



Feldspar crystals 



Magnetite specks 



Cavity partly filled with chlorite ... 



ROCK SECTIONS.— Mulgan. 



