His older aspect increased to a startling degree his resemblance to the Curwen portrait in his library; and Dr. Willett would often pause by the latter after a call, marvelling at the virtual identity, and reflecting that only the small pit above the picture’s right eye now remained to differentiate the long-dead wizard from the living youth.
The senses are instruments that define and differentiate sensation; and the result of one operation is that definite object upon which the next operation is performed.
That d might be an a, and that l an e. Men of character always differentiate their long letters, however illegibly they may write.
In the same way the child learns from many experiences to differentiate his feelings, and we name them for him—GOOD, BAD, GENTLE, ROUGH, HAPPY, SAD.
Hume, again, says somewhere in the Essay, that most men are naturally inclined to differentiate their discourse, inasmuch as they see their object from one side only, do not think of the objections, and conceive its corroborative principles with such liveliness that they pay no attention to those which look another way.