98 POWDERED VEGETABLE DRUGS 



I 4 Uniform. 

 2 4 Thicker on one side. 

 3 1 Special cells of testa. 



I 2 Size and form. Often very characteristic 

 2 2 Color. 



4 1 Endosperm (parenchyma) cells. 

 I 2 Form and size. 

 2 2 Cell-walls. 



I 3 Thickness. Quite variable. 

 2 3 Porosity. 



3 3 Form. Usually quite regular; wavy, irregular. 

 3 2 Contents. Usually not diagnostic. 



I 3 Starch. Absent or present. See starch under roots and 



rhizomes. 



2 3 Proteid granules. 

 3 3 Amylodextrin granules. 

 4 3 Oils and fats. 

 5 3 Crystals. 

 6 3 Resin, wax, etc. 

 5 1 Vascular tissue. Not specially characteristic. Plentiful in 



pericarp. Deficient in seeds. 

 IV. BARKS. 



I 1 Suberized tissue or true cork. 

 I 2 Size and form of cells. 

 2 2 Contents. 



I 3 Granular contents. Tannin. 

 2 3 Red or reddish brown coloring matter. 

 2 1 Lenticular structures. Like those of other plant organs. Not 



characteristic. 

 3 1 Bark parenchyma. Not diagnostic. 



I 2 Size and form of cells. Usually loosely united. Sometimes 



much elongated. 

 2 2 Contents. 



I 3 Crystals. Prismatic and aggregate. 

 2 3 Starch. Not plentiful or diagnostic. 

 3 3 Mucilage, resin, coloring matter, etc. 

 4 l Collenchymatous parenchyma. Not common or very 



characteristic. 



5 l Ducts and glandular structures. Not important. 

 6 l Bast fibres. Very important and diagnostic. 

 I 2 Occurrence. 

 I 3 Singly. 



