ments. The study of the perception of depth included an adaptation from Hering’s experiment, in which the subject, looking through a tube, finds that he can correctly distinguish, within very small distances, whether a shot is dropped before or behind a black string, stretched before a white background. The fact and the laws of convergence were studied with the aid of a Wheatstone stereoscope.
There followed a consideration of illusions of space; and of Unvisual space, including the experiments suggested by Dr. James on so-called tympanum spatial-sensations, and others, with a telegraph-snapper, on the location of sounds. The scope of the work is suggested by the following outline for a paper required at the close of the work, and written without consultation of books or of notes.
Space.—Review Subjects.
(Note: Support all statements by description of experiments bearing on the question.)
- Theories of Single Vision.
- Identical Point Theory.
- Statement.
- Limitations.
- Physiological Association Theory.
- Statement.
- Relation to a.
- Identical Point Theory.
- The Third Dimension.
-
- The Nativistic Position (in every form).
- “Empiristic““““
- How do we gain (or at least develop) the consciousness of the third dimension?
-
(Note: Include reference to the questions: Can we perceive depth without motion of the eyeballs? If so, what are the means of perceiving depth in the given case?)
III. The Value of the Empiristic Theory to the Nativist.
In the study of memory and of the imagination, the only experiments were a few on “The Mental Span.” Students were referred to James, to Burnham, to Lewes, to Ruskin and to Everett. Par-amnesia was of course discussed.
Abnormal psychology received, throughout the course, comparatively little attention, because it seemed so evident that a careful study of the facts of normal consciousness must precede any scholarly consideration of the abnormal; because, also, there seemed special need of combating the popular notion which apparently regards psychology as a synonym for hypnotism and telepathy. The abnormal was therefore treated throughout from the point of view of the ordinary consciousness and its phenomena were discussed as exaggerated manifestations of the phases of all consciousness. The subject was naturally introduced by a study of dreams; hypnotism was the only other topic considered.
The study of the emotions and of the will was accompanied by no experimental work. Chapters of Höffding, of James, of Mill, of Spencer and of Darwin formed the required reading; James’s theory of the emotions was discussed; a classification of the feelings, adapted from Mercier[1], but rejecting his physiological principle of division, was the starting-point of a somewhat practical discussion.
The last week of the course was occupied with reaction-time experiments, which had been postponed to this time, only through necessary delay in procuring the apparatus; the work should properly have been scattered through the year. There was time for
- ↑ Mind, Vol. IX.
