Dana, Prof. James D. — On the Volcanoes : 

 Phenomena of the Hawaiian Islands, 

 on the Petrography of the Islands, 1 



Canadian Geological Classification 



Mingaye, John C. H., r.c.s. — On the Occurrence of Telltirinni 



in New South Wales. 

 Eussell, H. C, B.A., F.K.S.— Papers read at the First Meeting 



-President's Address 



,nd Meteorological 



Tebbutt, John,F.E.A.s.- 

 Windsor, N.S.'\ 



The Brewers' Journal, V. 

 XXV., Nos. 28G- 



•Eeportof Mr.Teh 



1st Septemb 



THE ERUPTIVE ROCKS OF JS^EW ZEALAND. 



r Professor F. W. Hutton, Hon. Mem. R. S. of N. S. Wal 

 [With One Plate.] 





Boyal Society of N.i 



, i.S9,9.] 



Rocks are definerl as mineral aggregates. It is : 

 for the student to think that when the minerals 

 have been accurately determined, the name to 

 rock will follow as a matter of course. This however 

 means always the case. The minerals composing a rock 

 known and yet considerable difficulty may be experie 

 deciding by what name to call it. This difficulty arise 

 because the relative proportions of the different mineri 



rock-name having 

 gists, so that it is difficult to decide whom t 

 fusion, indeed, has become so great that some 

 names as much as possible and in their plai 



ngarc 

 ed to t 



o follow. The con- 

 petrologists discard 

 ,e give a list of the 



