Beiträge zur Kenntniss des Sehens in subjectiver Hinsicht.

Purkynĕ’s graduation dissertation on the subjective visual phenomena earned for him the appreciation of Goethe and the chair of physiology at Breslau. Reprinted in his Opera omnia, vol. 1, pp. 1-56,1918. There were two issues of the first edition published the same year. The second edition was published in 1823.