172 POWDERED VEGETABLE DRUGS 



other drugs, is not only readily recognized but it is ideal for the pur- 

 pose of making exact percentage counts. 



LIST OF SUBSTANCES WITH MICROSCOPICAL STRUCTURES UPON 

 WHICH THE PERCENTAGE COUNTS ARE TO BE BASED 



1. Absinthium. T-shaped trichomes. 



2. Aconite leaf. Trichomes. Sclerenchyma cells. 



3. Aconite root. Sclerenchyma cells. Starch aggregates. 



4. Amygdala. Sclerenchyma cells (for unblanched almonds only). 



5. Amylum. Size, form, markings, position of hilum, etc. 



6. Anisum. Trichomes. 



7. Asclepias. Groups of Sclerenchyma cells. 



8. Aspidium. Resin particles. Starch. Scalariform ducts. 



9. Aspidosperma bark. Large sclerenchymatous blast cells. 



10. Belladonna leaf. Trichomes? Cells with microcrystaUine calcium oxalate. 



11. Belladonna root. Starch? Cells bearing microcrystalline calcium oxa- 



late? Ducts? 



12. Berberis. Sclerenchymatous bast cells. 



13. Caffea. Sclerenchymatous bast cells. Endosperm cells. 



14. Calendula. Trichomes. Pollen. 



15. Calumba. Sclerenchyma cells. Starch. Ducts. 



16. Canella. Groups of Sclerenchyma cells. 



17. Cannabis. Simple trichomes. 



18. Capsicum. Color and characteristic epidermal elements. 



19. Carbo. Size and number of black particles. 



20. Caryophyllus. Bast cells. Color of tissue fragments. 



21. Cascarilla. Bast cells. 



22. Chamselirium. Bast cells. 



23. Cinchona. Large bast cells. 



24. Cinnamon. Bast cells. Sclerenchyma cells. 



25. Coca. Fragments of the lower epidermis. 



26. Colchicum corm. Starch granules. Spiral ducts. 



27. Convallaria. Number of raphides. 



28. Cornus. Groups of Sclerenchyma cells. 



29. Goto bark. Bast and sclerenchymatous groups. 



30. Crocus. Pollen grams and colored tissue. 



31. Cubeb. Groups of Sclerenchyma cells and of endosperm cells. 



32. Curcuma. Number of yellow particles (agglutinated starch). 



33. Cusso. Pollen. Simple and glandular trichomes. 



34. Cypripedium. Number of raphides. 



35. Dextrine. As for starch. Recognizable starch granules. 



36. Digitalis. Non-glandular trichomes. 



37. Eriodictyon. Non-glandular trichomes. 



38. Euonymus stem bark. Bast cells. Aggregate crystals. 



39. Eupatorium. Trichomes. Pollen grams. 



40. Galla (Chinese). Trichomes. 



41. Gentian. Fragments of large reticulate ducta. 



42. Glycyrrhiza. Groups of yellow tissue with crystal bearing fibers. Cork 



tissue in unpeeled licorice. Fibrous tissue of trimmings. 



