Skey. — On Tomlinson's Cohesion Figures. 498 



in consequence of this, exercises tlie property of adhesion to the greatest 

 extent in respect to its own parts, hence it coalesces in those annular 

 elevations which form the principal feature in the cohesion figures of Prof. 

 Tomlinson. 



I will conclude this paper by informing you that I consider this change 

 of oil into resinoid substances helps largely to produce those rapid changes 

 of colour which oil exhibits when exposed to the air upon a surface of water; 

 indeed, it appears to me that the effect of those chemical changes which 

 must take place in certain liquids when exposed to the air or brought into 

 contact with each other, has been ignored by those persons Avho have 

 hitherto investigated the subject of the flow of hquids upon each other. 



