SUMMARIES OF ARTICLES.
[Abbreviations.—Am. J. Ps. = American Journal of Psychology; Ar. f. G. Ph. = Archiv für Geschichte der Philosophie; Int. J. E. = International Journal of Ethics; Phil. Mon. = Philosophische Monatshefte; Phil. Stud. = Philosophische Studien; Rev. Ph. = Revue Philosophique; R. I. d. Fil. = Rivista Italiana di Filosofia; V. f. w. Ph. = Vierteljahrschrift für wissenschaftliche Philosophie; Z. f. Ph. = Zeitschrift für Philosophie und philosophische Kritik; Z. f. Ps. u. Phys. d. Sinn. = Zeitschrift für Psychologie und Physiologie der Sinnesorgane; Phil. Fahr. = Philosophisches Fahrbuch; Rev. de Mét. = Revue de Métaphysique et Morale.—Other titles are self-explanatory.]
PSYCHOLOGICAL.
The author's conclusions may be summarized as follows: (1) No one has ever seen light of one wave-length. (2) No conclusion may be drawn from the mixture of the colors of a dispersion- spectrum as regards an exceptional position of certain wave- lengths. (3) Purple is a component of white light, on the same level as any other color-quality. (4) Not only are spectral colors not perfectly pure: they are not equally pure in the same spectrum. [Criticism of the color-triangle construction.] (5) Definition of normal and color-blind vision. (6) Vision is achromatic, dichro matic, or polychromatic. [Criticism of Helmholtz.] (7) For poly chromates no universally valid distinction of ground-sensations or primary valences can be made. (8) Not all polychromates are normal. (9) There are various modes of transition from normal polychromatism to pure dichromatism: not every case of anomalous polychromatism presents such a transition-mode. (10) Dichroma tism does not display any constant preference in the matter of its two ground-colors. (11) There may be wanting the sensibility to any particular spectral quality, in dichromatism and polychromatism: there may be a transference of complementarism. (12) The 'neutral line' of color-blindness does not always by any means lie where it should, according to the ground-color theories. [Illustrations from ten cases.]
