TOLU BALSAM TONKA-BEANS. 283 



and convulsions, sometimes by very moderate doses. 

 Internally it is for this reason seldom used. As an 

 ointment, made by simmering the leaves in lard, it has 

 been employed in curing old ulcers and painful tumours. 

 The leaves were official in B.P. 1885. 



Distinctive character Several species are em- 

 ployed to yield tobacco. N. Tabacum yields Virginian ; 

 N.acuminata, R. Grah., Latakia; N. rustica, Linn., a good 

 deal of Persian tobacco ; but there are many varieties 

 of N. Tabacum itself. Some of these can be distinguished 

 under the microscope. 



TOLU BALSAM. Myroxylon Toluifera, H. B. & K. 



N.O. Leguminosfs. 



Syn. Balsam Tolu, Toluifera Balsamum, Baill. 

 Part used Balsam. 



Action Stimulant, tonic, expectorant. Used in 

 chronic catarrhs, pulmonary and bronchial affections, 

 coughs, &c. 



Preparations Tincture B.P. and U.S. P. : Dose, 

 -1 drachm. Syrup B.P. and U.S. P. : Dose, -1 drachm. 



Distinctive character A light brown, fragrant, 

 balsamic resin, softening in the warm hand, but on 

 keeping becomes brittle in winter. In a thin, even 

 layer between two warmed pieces of glass it is seen to 

 be transparent and to contain numerous crystals of cin- 

 namic acid. Taste, sweetly aromatic and faintly acid. 

 Odour, recalling vanilla, but different. 



TONKA-BEANS. Dlpteryx odorata, Willd. 



N.O. Ltguminosct. 

 Syn. Coumarouna odorata, Aubl. 



Part used Seeds. 



Action Aromatic, narcotic, cardiac tonic. Although 

 this drug has been used in whooping cough, it seems to 



