re what I see is capable of logical division
&gt; | into the sweet and the not sweet.  It is customary to
&gt; | assume that visual images are absolutely determinate
&gt; | in respect to color, but even this may be doubted.
&gt; | I know of no facts which prove that there is never
&gt; | the least vagueness in the immediate sensation.

ok. using senses as a discriminator is not appropriate.
terms exist in the 'mind's eye' so to speak.
Senses can be used to discriminate the individuals we just talked of.
in 