Saxat-ile), Gnaphalium sylvaticum, Digitalis purpurea.
To preserve the colour of flowers pledgets of cotton wool, which prevent bruising, should be introduced between them, as also, if the stamens are thick and succulent, as in Digitalis, between these and the corolla.
Hope dealing elements of disease, with its first beginnings; and in the field of therapeutics, chemical and biological experiment, as in the case of digitalis, mercury and the iodides, was rapidly simplifying remedies and defining their virtues, so that these agents could be used at the bedside with more precision.
Digitalis purpurea (Foxglove): hardy, 3 to 5 ft., rosy-purple or' white; beautifully spotted; the variety called gloxinioides has regular, erect flowers.
The leaves of the foxglove, gathered from wild plants when about two-thirds of their flowers are expanded, deprived usually of the petiole and the thicker part of the midrib, and dried, constitute the drug digitalis or digitalis folia of the Pharmacopoeia.
Digitalis was first brought prominently under the notice of the medical profession by Dr W.
Digitalis contains four important glucosides, of which three are cardiac stimulants.
Digitalis leaves have no definite external action.
The clinical influence of digitalis upon the heart is very well defined.
Almost equally striking is the fact that digitalis causes an irregular pulse to become regular.
These symptoms with more or less gastro-intestinal irritation and decrease in the quantity of urine passed indicate digitalis poisoning.
The initial action of digitalis is a stimulation of the cardiac terminals of the vagus nerves, so that the heart's action is slowed.
It is probable that digitalis increases the amount of water rather than that of the urinary solids.
In large doses the action of digitalis on the circulation causes various cerebral symptoms, such as seeing all objects blue, and various other disturbances of the special senses.
Digitalis is used in therapeutics exclusively for its action on the circulation.
But digitalis is indicated whenever the heart shows itself unequal to the work it has to perform.
Iron may, however, be prescribed in combination with digitalis by the addition of dilute phosphoric acid.
Thus, in Veronica, the rotate corolla has one division much smaller than the rest, and in foxglove (Digitalis) there is a slightly irregular companulate corolla.
- Corolla of foxglove (Digitalis purpurea), cut in order to show the didynamous stamens (two long and two short) which are attached to it.
By the middle of the 19th century there were many workers on the subject, and the actions of such drugs as digitalis, morphine, alcohol, and many others had been frequently and minutely investigated.
Certain substances, notably digitalis, lead, mercury and strychnine, exhibit what is called a cumulative action - that is to say, when small quantities have been taken over a period of time, poisoning or an excessive action suddenly ensues.