Soils and Soil- formers.] SUBANT ARCTIC ISLANDS OF NEW ZEALAND. 



769 



656 is an olivine basalt from cliff between the Gap and Horseshoe Bay, Ross 

 Archipelago ; analysis by Prior. 



Merrill (27) gives a number of analyses of basalts and their residuals on weather- 

 ing, and calculates the percentage of each ingredient lost in the altered product. 

 Potash is one of the ingredients invariably lost in large amounts. In the samples 

 analysed from the Auckland and Campbell Islands it will be seen that the reverse 

 is the case ; the humus acids evidently hinder the decomposition of the potassic 

 compounds. 



J 833a and J 833b were collected at a depth of 3 ft. 7 in. from shaft sunk at 

 Skua Gull Flat, Camp Cove, on the 26th November, 1907. 





K 3000. 



K 2645a. 





Basalt, Enderby 



Rotten Rock, 





Island. 



Auckland Island. 



Silica (SiOg) . . 



45-65 



42-30 



Alumina (Al^O.^) 









14-10 



18-05 



Ferrous oxide (FeO) 









1 13-95 





Ferric oxide (FegOg) 









10-55 



Calcic oxide (CaO) 









9-10 



1-00 



Magnesic oxide (MgO) . . 









7-02 



1-38 



Manganous oxide (MnO) 









0-08 



, . 



Phosphoric anhydride (P2O5) 









0-52 



0-25 



Titanic oxide (TiO.,) 









3-70 



4-10 



Potassic oxide (KgO) 









1-01 



1-05 



Sodic oxide (NagO) 









3-82 



3-38 



Loss on ignition 









1-30 



18-40 



K 3000 is unweathered basalt from Enderby Island beach. 



K 2645a is much-decomposed rock from below high-water mark on beach. Camp 

 Cove boat-depot, Auckland Island. 



Granite from 



Snares 



Island. 









K 1297. 





K751. 



Weathered by Atmo- 





Unweathered. 



spheric Influences 

 and Sea-water. 



Silica 



72-00 



73-03 



Alumina 









12-96 



13-56 



Ferric oxide 









1-98 



1-80 



Titanic and zirconic oxides 









1-56 



1-20 



Manganese-oxide 









0-30 



0-30 



Calcic oxide 









1-12 



0-82 



Magnesic oxide 









0-41 



0-28 



Sodic oxide . . 









5-85 



5-35 



Potassic oxide 









4-06 



3-95 



Loss at 110° C. 









0-20 



3-50 



These were collected from the Snares Island beach. 

 50— R. 



