94 POWDERED VEGETABLE DRUGS 



4 3 Vertical walls. In vertical view. 



I 4 Thickness. Not excessively variable or characteristic. 

 2 4 Form. Wavy or straight; often a diagnostic comparative 



feature. 



3 4 Porosity of walls. 



4 4 Nodular thickenings. Characteristic when present. 

 5 3 Cell-contents. Not commonly present or plentiful. 

 I 4 Chlorophyll. Usually wanting, not characteristic. 

 2 4 Starch. Very rarely present. 

 3 4 Crystals. Not common, diagnostic on occasion. 

 4 4 Inulin and hesperidin. Plentiful and diagnostic in a few 



instances (Buchu). 

 5 4 Coloring matter, resin, wax. 

 6 4 Tannin, etc. 



6 3 Hair cells (trichomes). Very important and diagnostic. 

 I 4 Nonglandular. 

 I 5 Simple. 



I 6 Single-celled. 



I 7 Size. Rather variable. 

 2 7 Form. Sometimes diagnostic. 

 3 7 Thickness of walls and exterior markings. 

 2 6 Many-celled. 

 I 7 Number of cells. 

 2 7 Size, form, etc., as above. 



2 5 Aggregate or stellate. Quite characteristic and diag- 

 nostic. 



I 6 Number of cells. 

 2 6 Form and relative position of cells. 

 3 5 Branching. Quite characteristic. 

 I 6 Number of cells. 

 2 6 Size and form of cells. 

 3 6 Number of branching cells. 



2 4 Glandular. Usually few, small and quite indistinct. 



Sometimes diagnostic. 

 I 5 Neck or basal cells; size and number. 

 2 5 End or secreting cells; size and number. 

 3 4 Neighboring cells. 



I 5 Number. Sometimes diagnostic. 



2 5 Size and form. Radially elongated. 



4 4 Contents. Usually none in nonglandular hair-cells; 

 when present, quite diagnostic. (Cannabis 

 Indica) . 



