46 



J. P. KUENEN. 



This law thus appears quite independent of the approximate laws of 

 mixing, on which it was originally based. There can be no donbt but 

 that it would have taken a much longer time to be discovered, had it 

 not been suggested in a natural way by the approximate laws. 



However natural the law may seem to us now, it is in no way a 

 self-evident law. Whether it is correct can only be settled by expér- 

 imenta and the experiments suggested above might be used for the pur- 

 pose. Other experiments may serve equally well, but those which 

 I have indicated seemed to be the simplest. 



Dundee, University Collège. 

 June 1901. 



