348 MATERIA MEDIC A AND THERAPEUTICS. 



Characters. In flat pieces ; the inner surface yellow and 

 fibrous, outer reddish-brown under a greyish epidermis. Has 

 a faint odour of turpentine. 



Substance resembling Larch Bark : Eed Cinchona Bark, 

 known by bitter taste. 



Composition. Larch bark yields an oleo-resin, Venetian 

 turpentine, brownish-yellow, tenacious, with an aromatic bitter 

 taste and a pleasant nutmeg-like odour. In its general 

 characters and properties it closely resembles ordinary crude 

 turpentine. 



Preparation. 



Tinctura Laricis. 1 in 8. Dose, 20 to 30 min. 



ACTION AND USES. 



Larch closely resembles turpentine in its action, but is 

 more pleasant. It is used (but rarely) in the same class of 



Thus Americamim COMMON FRANKINCENSE. 

 The concrete turpentine of Pinus Tseda, the Frankin- 

 cense Pine, and Finns palustris. the Swamp Pine. 

 From the southern states of North America. 



Characters. A softish, bright-yellow, opaque solid, resinous 

 but tough, having the odour of American turpentine. 



Composition. This is apparently the same as the composi- 

 tion of common resin. 



Thus Americanum is contained in Emplastrum Picis. 



ACTION AND USES. 



Frankincense has the same action and uses as resin and 



its allies just described. 



Fix Burgimdica BURGUNDY PITCH. A 

 resinous exudation from the stem of the Spruce Fir, 

 Abies excelsa. Melted and strained ; imported from 

 Germany. 



Characters. Hard and brittle, yet gradually taking the 

 form of the vessel in which it is kept ; opaque, varying in 

 colour, but generally dull reddish-brown ; of a peculiar some- 

 what empyreumatic perfumed odour, and aromatic taste, 



