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70 THE FOURFOLD HOOT. [CHAP, iv.
explanation still further. All those parts of the object
which lie to one side of the vertex of the optic angle no
longer send their rays straight into the centre, but to the
side, of the retina in each eye ; in both sides, however, to the
same, let us say the left, side. The points therefore
upon which these rays impinge, correspond symmetrically to
each other, as well as the centres in other words, they are
Fig. 2,
o
A
homonymous points. The Understanding soon learns to
know them, and accordingly extends the above-mentioned
rule of its causal perception to them also ; consequently it
not only refers those rays which impinge upon the centre
of each retina, but those also which impinge upon all the
other symmetrically corresponding places in both retinae,
to a single radiant point in the object viewed : that is, it
sees all these points likewise as single, and the entire