This section is from the book "The Materia Medica Of The Hindus", by Udoy Chand Dutt. Also available from Amazon: The Materia Medica Of The Hindus.
Karanja.
Nactamάla.
Vern. Darkaranja, Benq. Kiramάl, Hind,
This tree appears to be common in, and well known all over India. The seeds are much used as an external application in skin diseases. The expressed oil of the seeds is used in these diseases as well as in rheumatism. A poultice of the leaves is applied to ulcers infested with worms. The seeds of Pongamia glabra, Cassia Tora ( chakramarda), and the root of Aplotaxis auriculata (kushtha), are rubbed into a paste with cow's urine, and applied to eruptive skin diseases.1
Prithisάra taila.2 Take of the expressed oil of the seeds of Pongamia glabra one seer, kάnjika eight tolάs, roots of Plumbago Zeylanica ( chitraka), Nerium odorum (karavira ), Vitex Negundo (nirgundi), aconite, and the seeds of Corchorus olitorius (nάdika), eight tolas each, in the form of a paste made with kanjika. Mix them together and warm in the sun. This oil is said to be useful in various sorts of skin diseases, ulcers etc.
Tiktadya ghrita.3 Take of the leaves and fruits of Pongamia glabra, root of Picrorrhiza Kurroa, ( katuki), wax, turmeric, liquorice root, leaves of Trichosanthes dioica (patala), Aganosma caryophyllata (mάlati) and Azadirachta Indica (nim), equal parts, in all one seer. Beat them into a paste and boil with four seers of clarified butter and sixteen seers of water in the usual manner. This preparation is used as an ointment in unhealthy ulcerations and wounds.
 
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