responsible for sensation of grey, [59];

associates, [149], [168];

a complex and plastic machine, [150].

Brain-habit, in perception and idea, [115] ff., [131];

in perceptions of time, [123];

in perception of distance, [129] f., [131];

in perception of visual movement, [133] f.;

in optical illusion, [137];

in direct apprehension, [182] f.;

in memory, [185];