48i Transactions. — Geology. 



p. 368, on the supposition that the large percentage of silica is 

 due to the secondary deposition of tridymite, which appears to 

 be the case. 



(Page 120.) 

 Palla. — For a reference to Sir J. von Haast's use of this 

 term, see Trans. N.Z. Inst., vol. iv., p. 85. It is there said to 

 occur also in Transylvania. 



(Page 122.) 

 Hornblende Trachyte from the Sugar Loaves, Taranaki. — 

 Plagioclase is more abundant than sanidine (Baron). An 

 analysis of this rock has been published in the Laboratory 

 Report, No. 25, for 1889-90, p. 59, which shows that it con- 

 tains only 53-43 per cent, of silica. It should therefore be 

 called a hornblende andesite. 



(Page 128.) 

 Enstatite Diorite from Bluff Hill. — This is a norite, or 

 enstatite-gabbro, the hornblende being secondary {Baron). 



(Page 129.) 

 For " porphyrite " substitute " aphanite," as the term 

 " porphyrite " is now generally used for an altered andesite. 



(Page 130.) 

 Augite Porphyrite from Enfield. — These rocks are basalts 

 [Baron) . 



(Page 142.) 

 Olivine Andesite from Banks Peninsula, No. 2. — This rock 

 has been described in detail by Mr. R. Speight in the Trans. 

 N.Z. Inst., vol. XXV., p. 367. The specific gravity is only 2-61. 



(Page 150.) 

 Basalt Group. — Under this head ehminate the words " and 

 plagioclase." 



(Page 151.) 

 Basalt from Banks Peninsula, No. 1. — This rock comes 

 from what is known as the Halswell Quarry. 



CORKECTIONS IN OtHER PaPEES. 



" Transactions of the New Zealand Institute," vol. xxiii.,p. 354. 

 The hornblende diorites are epidiorites, as the hornblende 

 is secondary ; originally they were enstatite-gabbros. The 

 hornblende porphyrite should be called a dolerite. 



" Transactions of the Neiv Zealand Instit^ite," vol. xxiv., p. 363. 

 The hornblende diorites are, probably, epidiorites. I have 

 a specimen of a boulder from near Cuttle Cove, Preservation 

 Inlet, which Mr. Baron is confident is an epidiorite. 



