o08 Kenneth A. Mickle: 



When 40 gms. had been added the magma showed a tendency 

 to break up on agitation into smaller lumps, but showed no 

 tendency to attach air bubbles. 



With 80 gms. of copper pyrites the product formed was a mass 

 of coherent aggregates under the solution, each aggregate being 

 about the size of fishes' roe. 



With 120 gms. many air bubbles became attached, and a 

 marked tendency to float was shown. The aggregates were 

 smaller than when 80 gms. of copper pyrites had been added. 



With galena and kerosene all the oil was not carried down 

 till 80 gms. had been added. The products were less coherent 

 and less viscous than with the thicker oils. 



With galena and petrol a considerable excess of oil showed on 

 the surface of the water when 40 gms. of the galena had been 

 added. 



Using machine oil Avith galena, very little excess of oil showed 

 on the surface when 30 gms. galena had been added, and no 

 excess showed with 40 gms. With 60 gms. galena the magma 

 showed a tendency to break up on j^haking and to attach air 

 bubbles. 



With 5 gms. cotton seed oil and galena a small excess of free 

 oil appeared on the surface of the water when 30 gms. galena 

 had been added. No excess of oil showed with 40 gms. galena. 

 The putty-like magma formed, but was not so caseous as with the 

 thicker oils. Xo distinct stage occurred at which the oily 

 magma broke up into smaller rounded lumps, as in the case with 

 some of the oils. 



With 60 gms. a tendency to attach air bubbles was shown by 

 the magma, and when 80 gms. galena had been added some of 

 the galena would float on agitation. 



Using a eucalyptus oil containing 80 per cent, phellandrene, 

 it was not till 80 gms. of the galena had been added that all the 

 oil was carried down. No distinct " putty " stage cccurred, all 

 the oily products being more or less like a freely moving pulp. 



A series on the same lines as the above tests, but using min- 

 erals that had been " sized," was then tried. Some galena 

 crushed to pass a 30-mesh (linear inch) sieve, but retained on a 

 40-mesh, was mixed with water and 5 gms. oleic acid, as in the 

 other tests. 



