512 POWDERED VEGETABLE DRUGS 



195. (Fig. 187.) TABACUM. Tobacco. 

 Fine powder, as snuff and insecticide. 



Tabak, G. Tabac, Fr. 



The leaves of Nicotiana tdbacum L., and cultural varieties, Sol- 

 anaceae. 



Dark brown. 



Heavy, characteristic; variable as to variety and manner of 

 curing and preparing. 



Pungent, 



Stomata above and below; vertical walls, wavy and somewhat 

 porous. Many-celled simple trichomes, thin- walled; most of them 

 terminating in from one to many rather small secreting cells. No 

 palisade tissue. Leaf parenchyma, with rather large cells filled with 

 crystal sand of calcium oxalate. 



Ash 14 to 25 per cent. 



Numerous cultivated varieties. Extensively adulterated with 

 a great variety of leaves from other plants, as those of cabbage, beet, 

 chestnut, rose, cherry, peach, etc. Tobacco trimmings and tobacco 

 stems are used as adulterants. 



