500 Transactions. 



section, Hyperstheue with faint pleochroism rather frequent. 

 Olivine less abundant, and some diallage. Iron-ore (magnetite) 

 distributed as inclusions in most of the minerals. 



Gneisses. 



Resolution Island (G 13) : Hand-specimen with marked 

 schistose structure showing biotite and muscovite. Section : 

 Structure cataclastic. Quartz highly irregular but plentiful. 

 Muscovite and biotite in about equal quantity. The plates of 

 the former often contain inimerous highly refringent needles 

 with straight extinction. They have negative elongation, evi- 

 dently sillimanite. 



Pigeon Island, Dusky Sound (G 5) : Rock very similar to 

 that from Resolution Island. 



Pigeon Island, Dusky Sound (A 13) : A perfectly white rock 

 showing cleavage planes of feldspar on the fractured surface. 

 Section : Oligoclase forms nine-tenths of the rock. There is a 

 little interstitial quartz and a few small plates of muscovite. 



Dea's Cove (A 9) : A white rock with many feldspar cleavage 

 surfaces and some small specks of mica. Section : Chiefly 

 microcline, perfectly fresh, and finely twinned ; some biotite, 

 very dark-coloured, and a good deal of interstitial quartz. 



Bowen Falls, Milford Sound (G 12, G 11) : Hand-specimen 

 shows large hornblende aggregates imbedded in a white feld- 

 spathic mass. Section shows abundant crystals of oligoclase, 

 the lamellae much bent and broken and often having undulose 

 extinction. Throughout the oligoclase small needles and idio- 

 morphic crystals of epidote, colourless in section, have formed 

 in abundance (Plate XXIII, fig. 2), but otherwise the feldspar is 

 perfectly clear and fresh. Hornblende abundant, often showing 

 secondary corrosion in perfection. Except in the corroded 

 cavities of the feldspar there is but little quartz in the section. 

 Brown mica in large plates often associated -wdth the hornblende. 

 Some rutile, both brown and colourless. The epidote needles 

 in the feldspar usually have their longer arcs parallel to the 

 basal plane or to the brachypinacoid. 



Road one mile from Beech Huts (G 22) : A pale-grey rock 

 with distinct gneissic structure. Section shows interlocking 

 grains of triclinic feldspar (albite), some microcUne and quartz. 

 There is a small quantity of epidote in rounded grains and some 

 rutile. Thin plates of muscovite are abundant. 



Anita Bay, Milford Sound (G 4, G 18) : Hand-specimen a 

 dark rock shownng much hornblende on the broken surface, 

 large garnets, and a grejdsh-green epidote. Section : Hornblende 

 bright-green with strong pleochroism to pale-brownish green. 



