(227) 
also adopt a method by which a suitable characteristic of an emulsion is 
measured separately. For a transition period it will be desirable to try to 
combine these two results to give a value analogous to our present resolving 
power, but finally we should seek the method by which these new values can 
be used to determine the conditions for the best photographs for different 
purposes. This may result in the replacement of the resolving power by some 
entirely new concept.