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The various points dealt with in this paper are intended mainly as a public answer to some of the questions put most frequently to me by foreign colleagues who have visited me at the Finsen Medical Light Institute in Copenhagen.
These questions may be thus summarized:
What sort of light is best, and what is the most efficient type of lamp?
What instruments and plant are necessary, and what is the most practical way of organizing and arranging matters?
What ailments may be treated successfully, and what results may be expected if plant and equipment are properly used?
THE BEST SOURCE OF LIGHT
The sun, unquestionably, is the best of all sources of light in places where sunlight is available. Unfortunately, sunlight is not available in very many places on the European continent. The best districts are to be found in the southern Alps, in Switzerland, and in the southern