I. The apparent shapes of Jisures observed obliquely (pp. 339-347). 11. Hering's observations on ' GwZch!niss$arben~ (pp. 347-351). Experimentson apparent sizes (pp. 351-355). IV. The tendency to equalize wrtical semi-axes i n perception of tibe inclined square and the phenomenal regression of parallel lines (pp. 355-358). V. Summary (pp. 358-359). 1 H. J. M'att, for example, a y e : ''Generally 8 plate looks what it 'really' is, circular, not elliptical as the retinal image of it really is(l)." J. of Psych. XXI. 4 23l The perspective shape is not, of course, exactly an ellipse, but a figure resembling an ellipse with one of the short semi-axea longer than the other. The difference, however, is small and, eince the judgments of the subject were only with respect to the relative lengths of the axes, it is of no importance for the purpose of the experiment.

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