_The Third Trope_. The third Trope limits the argument to the sense-perceptions of one man, a Dogmatic, if preferred, or to one whom the Dogmatics consider wise,[1] and states that as the ideas given by the different sense organs differ radically in a way that does not admit of their being compared with each other, they furnish no reliable testimony regarding the nature of objects.[2] "Each of the phenomena perceived by us seems to present itself in many forms, as the apple, smooth, fragrant brown and sweet." The apple was evidently the ordinary example given for this Trope, for Diogenes uses the same, but in a much more condensed form, and not with equal understanding of the results to be deduced from it.[3] The consequence of the incompatibility of the mental representations produced through the several sense organs by the apple, may be the acceptance of either of the three following propositions: (i) That only those qualities exist in the apple which we perceive. (ii) That more than these exist. (iii) That even those perceived do not exist.[4] Accordingly, any experience which can give rise to such different views regarding outward objects, cannot be relied upon as a testimony concerning them. [1] _Hyp._ I. 90. [2] _Hyp._ I. 94. [3] Diog. IX. 11 81. [4] _Hyp._ I. 99. The non-homogeneous nature of the mental images connected with the different sense organs, as presented by Sextus, reminds us of the discussion of the same subject by Berkeley in his _Theory of Vision_.