1867 Nov. 24 I wish to investigate the nature of a simple [wraph] Such a concept first arises as predicated of some object (occasion of experience) S is M On the ground of some previous representation of the object. (Not immediate) The predication of the concept is virtually contained in the previous representation
To say that a simple concept is the immediate apprehension of a quality is [that] a mode of saying that its meaning is given in the repre sentation which gives rise to it [inasmuch] as it [is] as much [is] to say that that quality is contained in the representation.
Of the Effect of a Change of Information
Suppose it is learned that Any S is P Not P is not S Some P is S Then S receives an addition to its comprehension
not S to its extension P an addition to its extension Any S is not P not P receives an addition to its extension not S receives an addition to its extension Also S receives an indefinite addition to its extension
If are looking at an S find it to be P. Some S is P This adds to the extension of P - supposing we know what S Any S is not P This adds to the comprehension of S - supposing we know something of not P