314 Kenneth A. MicJde: 



A Primary adsorption — no cohesion of particles. 



B Secondary attachments — cohesion. 



C Greater cohesion — forming small aggregates. 



D Larger aggregates. 



E Oily magma — all the interstitial spaces filled with oil. 



Analogy of oil adsorptions with water adsorptions. 



Oil attachments and water attachments present many similari- 

 ties. A sulphide carrying 2 or 3 per cent, oil cannot be 

 deprived of its oil by gravity, centrifugal force or other mechani- 

 cal means. Similarly in the case of wet sand cariying a similar 

 proportion of water, the w^ater cannot be readily separated 

 mechanically. In both cases with the small attachments the 

 laws of gravity are not obeyed. With larger proportions the oil 

 and water will separaite out by gravity. 



There is also a similarity between the gradual wetting of a 

 finely crushed mineral with water, from the feebly coherent 

 damp mineral to the thick coherent pulp, and the feebly coherent 

 sulphide with a small proportion of oil to the various stages 

 of oily magma. "Whether the mineral particles are feebly 

 coherent, due to the presence of a small quantity of water, or 

 when under the surface of a solution the mineral particles are 

 feebly coherent, due to the presence of a small quantity of oil, 

 in both cases the interstitial spaces remain unfilled, in the first 

 case with water and in the second with oil. 



In the presence of excess of water and when the mineral has 

 adsorbed as much oil as it will, the interstitial spaces become 

 filled with the respective liquids to form coherent pulp or 

 magma. 



Gas attachments. 



In my previous paper it was shown that mineral particles 

 would adsorb gases to an extent not previously suspected, and 

 that they would retain the gas adsorptions with such a persist- 

 ency that they could neither be easily separated by mechanioal 

 means nor much affected by gravity and gas expansion. It w^as 

 also shown that in the case of adsorptions consisting of a mix- 

 ture of gases, the respective gases may be separated fractionally, 



