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.
Manaka, Vern. Mάnkachu, Beng. Mάnkanda, Hind.
The underground stems of Alocasia Indica constitute a valu-able and important vegetable of native dietary. The stems sometimes grow to an immense size, from six to eight feet in length and can be preserved for a considerable time. Hence they are of great importance in jail dietary when fresh vegetables become scarce in the bazar or jail garden. They thrive best in shade under the eaves of huts or buildings and beside fences.

Medicinally mάnaka is said to be useful in anasarca, in which disease it is used in the following manner. Take of the powdered meal of Alocasia Indica eight tolas, powdered rice sixteen tolas, water and milk, forty-eight tolάs each, boil them together till the water is evaporated. This preparation called Mάnamanda, is given as diet.1 No other article is allowed in addition to it except milk. A ghrita is also ordered to be made with a decoction and paste of mάnaka but it is not in vogue.
 
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