Kjøbenhavn, Jacob Lund, 1885. Orig. bogtrykt omslag. Løs i heftningen og omslaget med rifter og pletter. (4),91 pp. Indvendig pæn.
First edition. The most importent Danish work in psychology. It is a psychophysiological study on vasomotor disturbances and conditioned reflexes during period of emotional stress - known as the James-Lange-theory.