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1832 A. T. Thomson Elem. Materia Medica & Therapeutics I. 669 Quassina..is obtained by evaporating a strong decoction of Quassia chips to the consistency of an extract.

1900 G. S. Saunders in E. T. Cook Cent. Bk. Gardening 508 Quassia chips should be soaked..and then boiled.

1997 Independent 25 Feb. ii. 9/2 Natural remedies for head lice using quassia chips or essential oils abound.