Quartz Veins and Mineralised Manses. 197 



glassy inclusions and gas-bubbles throughout their mass. The gneiss 

 at some distance from the diabase yielded upon assaj'ing at the rate of 

 four grains of gold per ton, whilst samples taken at the cataracts from 

 near the contacts of the gneiss and the intrusive diabase yielded at the 

 rate of seventeen grains of gold per ton of the gneiss. 



Mineralised masses of country rock such as those described are 

 doubtless of great importance as sources of gold, especially in the 

 central districts of the Colony. 



