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G. S. FULLERTON:
It is not hard to see that we cannot distinguish in a body figured "many different resemblances and relations," without bringing the resembling elements in some sense singly into thought: if the mental complex which we call an object were an indissoluble unit, we might affirm a general likeness or unlikeness between it and other objects, but we could not affirm that the resemblance lay in the figure, or colour. If, as Hume asserts, the figure and colour "are, in effect, the same and undistinguishable," why do we find the one susceptible of the one class of resemblances, and the other of another class? If we take the words literally, should not the figure, viewed in one aspect, be susceptible of resemblances of figure, and viewed in another, of colour? And similarly, if the colour is one with the figure the same and undistinguishable, should not the colour, viewed in one aspect, be susceptible of resemblances of colour, and viewed in another, of figure? Hume's admission that the two elements are known as giving different resemblances in itself refutes his previous assertion that they are undistinguishable. If colour be recognised as like colour, and figure like figure, the two qualities are distinguished as different, and are in reality separately grasped.
I will now take a passage from J. S. Mill's Examination of Sir William Hamilton's Philosophy (c. xvii.):