Canterbury and Westland. 353 



The result of the analysis of this rock, of which the specimen sent 

 was beginning to show a little decomposition, is very striking, as 

 alkalis are entirely missing, and lime is present in such large 

 quantities. 



This rock deserves, perhaps, another name, as the perfect resem- 

 blance with the sanidine trachyte of Kuhlenbronn, is only one of a 

 -superficial character. 



The following analyses were made in the Laboratory of the Imperial 

 Polytechnical Institute of Vienna, under the direction of Prof. Dr. "A. 

 Schrotter, at the request of my friend Prof. Dr. P. von Hochstetter, 

 by the different chemists, the names of whom are appended to each. 



A. — Black JDolerite Lava from Banks' Peninsula, 

 (V. Alder.) 



Silica 



Alumina 



Sesqiuoxyde of iron 



Protoxyde of iron 



Carbonate of Lime 



Lime... 



Protoxyde of manganese 



Magnesia 



Oxyde of titanium 



Potash 



Soda ... 



99781 



The specimen was dried in a dessicator at a temperature of 110 

 deg. Centigrade (Celsius) and lost by that operation O'SGO water. 



B. — Bolerite Lava from Banks' Peninsula. 

 (H. J. Rossmeissl.) 



Silica ... ... ... 54-616 



Alumina with traces of oxyde of titanium... 18-042 



Sesquioxyde of iron ... ... 7^053 



Protoxyde of iron... ... ... 4*192 



Lime... ... ... ... 6'817 



Protoxyde of manganese ... ... 0971 



Magnesia ... ... ... 2*163 



Potash ... ... ... 1235 



Soda ... ... ... ... 3-910 



Water ... ... ... 1-003 



Per cent, 



51-097 



17389 



0-492 



6050 



2-852 



6967 



0-521 



3-07 1 



0-791 



0-396 



1147 



100.002 

 The water was expelled at a temperature of 100 deg. Centigrade 

 (Celsius). 



