Phototherapy : (1) the chemical rays of light and small-pox--(2) light as a stimulant--(3) the treatment of lupus vulgaris by concentrated chemical rays / by Niels R. Finsen ; translated from the German edition, and with an appendix on the light treatment of lupus ; by James H. Sequeira.

Date:
1901
Catalogue details

Licence: In copyright

Credit: Phototherapy : (1) the chemical rays of light and small-pox--(2) light as a stimulant--(3) the treatment of lupus vulgaris by concentrated chemical rays / by Niels R. Finsen ; translated from the German edition, and with an appendix on the light treatment of lupus ; by James H. Sequeira. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    that I was obliged to share the work with an assistant. Each of us watched two eggs, thus taking count of four, so that the enumeration had some chance of being exact. The following table of numbers was obtained under these conditions : Number of Eggb. 4 4 4 4 4 4 4 4 4 4 4 (Quality of Light. Blue Shade Red Blue Red Blue Yellow Shade Yellow Green Colourless glass Duration of Experiment in Minutes. 3 6 3 3 6 6 2 5 7 7 4 Number of Movements. 8 0 0 4 3 26 0 - 2i Temp. 22° C. 6i The absence of the sun necessitated our interru])t- ing our experiments, which were resumed two days later with the same ene’S : Number of Eggs. 4 4 4 4 4 4 4 Light. Colourless glass Blue Red Blue Shade Green Blue Jlinutes. 5 4 5 3 10 10 Nunilier of Jlovciuents. 12 9 2 7 0 6 15 Temp. '22° C. Tlie experiments made in the above order had to be stopped owing to an accident: one of the foetuses, becomiuo: det;iched from the e<io:, swam freelv. To exclude variations due to heat from the phe- nomena observed, I took care to maintain a constant temperature liy a current of fresli water. The results are thus clear and def nite. It is seen at once with what rapidity the movements are produced under tlie iidluence of blue light. T3y the