Abstract
The effects of various radiations on the potency and keeping qualities of digitalis were studied. The official tincture of digitalis was used in our experiments. The activity of the preparations was tested in two ways: on the one hand by the cat method, and, on the other hand by the new phytopharmacological method developed by the authors and described elsewhere.1 The effect of ultra violet rays was studied with a Krohmayer water-cooled mercury vapor quartz lamp and with the Hanovia Alpine Sun Lamp. Tincture of digitalis was radiated with these machines in quartz containers and in pyrex and ordinary glass test tubes for various length of time. The effect of ultra violet radiation was to produce a rapid deterioration of the tincture. Radiation for one hour with the Krohmayer lamp or with the Alpine Sun Lamp of digitalis in a quartz tube produced as much as 30 per cent deterioration in some cases. An analysis of the various rays short and long, in respect to their activity on digitalis, showed that the shor...
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