CHAPTER IV.

ILLUSIONS OF PERCEPTION--_continued_.

A. _Passive Illusions (a) as determined by the Organism._
_Results of Limits of Sensibility_:--Relation of quantity of Sensation to
that of Stimulus, 50-52; coalescence of simultaneous Sensations,
52-55; after-effect of Stimulation, 55, 56; effects of prolonged
Stimulation, 56-58; Specific Energy of Nerves, 58, 59; localization
of Sensation, 59-62; Subjective Sensations, 62-64.

_Results of Variation of Sensibility_:--Rise and fall of Sensibility,
64-67; Paræsesthesia, 67, 68; _rationale_ of organically conditioned
Illusions, 68, 69.


CHAPTER V.

ILLUSIONS OF PERCEPTION--_continued_.

A. _Passive Illusions (b) as determined by the Environment._
_Exceptional Relation of Stimulus to Organ_:--Displacement of organ,
etc., 70-72.

_Exceptional Arrangement of Circumstances in the Environment_:--
Misinterpretation of the direction and movement of objects, 72-75;
misperception of Distance, 75, 76; Illusions of depth, relief, and
solidity in Art, 77-81; Illusions connected with the perception of
objects through transparent coloured media, 82-84; visual transformation