Ueber die Anwendung von concentrirten chemischen Lichtstrahlen in der Medicin / von Prof. Dr. Niels R. Finsen. Leipzig : F. C. W. Vogel, 1899. F516oG 1899 Osler - Robertson.
This plate depicts nurses assisting patients in the usage of directed ultraviolet light through a Finsen's lens to treat lupus vulgaris.