III.— GEOLOGY 



Art. XL. — Corrections in the Names of Some Neio Zealand 



Bocks. 



By Captain F. W. Hutton, F.R.S., Curator of the Canter- 

 bury Museum. 



[Read before the Pldlosophical Institute of Canterbury, 3rd August, 



1898.] 



In September, 1897, the Eev. Eichard Baron, who is well 

 known from his researches on the rocks of Madagascar, while 

 on a visit to New Zealand, examined the greater part of the 

 collection of rocks in the Museum on which my paper on 

 "The Eruptive Rocks of New Zealand,"* was founded. He 

 agreed with most of my descriptions, but made some criti- 

 cisms and corrections, which he has kindly allowed me to 

 publish. To these I add a few remarks and alterations 

 which I wish to make myself. 



Corrections in Paper on " The Eruptive Rocks of New 



Zealand." 



(Page 109.) 



Foot-note. — For " colloid glass " read " cooled glass." 



(Page 112.) 



Granite from Cape Fouhoincl. — The alternating layers of 

 orthoclase and microline form what is commonly known as 

 " chesterlite." 



Granite from Port William. — The occurrence of microline 

 is doubtful {Baron). 



Gra7iite from Denniston. — Contains sphene {Baron). 



(Page 114.) 

 For " elvanite" substitute " eurite," as the term " elvan- 

 ite " seems to have dropped out of use. 



(Page 115.) 

 Bhyolite from Lyttelton. — This has been called a tridymite- 

 trachyte by Mr. P. Marshall, in Trans. N.Z. Inst., vol. xxvi., 



* Pro. Royal Soc. N. S. Wales, vol. xxiii., p. 102, 1889. 



