The bark of the trunk of Cinchona Calisaya.

containing at least 2 per cent. of quinine. Collected in Bolivia

Fig. 201. - Cinchona Calisaya Bark, half the natural size.

and Southern Peru.

Characters. - In flat pieces, or quills. The flat pieces are recognised by their tawny yellow colour, and by the long channelled depressions left on the outer side of the bark by the gouge with which the epidermis has been removed. Transverse fracture shows numerous very rigid glistening fibres, short and very fibrous. Powder cinnamon-brown, somewhat aromatic, persistently bitter.