DESCRIPTION OF PLATE V 



Fig. 17. — Bean Tissues. — i. Epidermal palisade tissue with the crystal-bearing 

 hypoderm. 2. Starch-bearing endosperm tissue. 3. Starch granules with promi- 

 nent fissured hili. 4. Spongy tissue. 5. Epidermal palisade cells- in vertical view. 

 6. Prismatic crystals of calcium from hypoderm. 



Ground beans, peas and lentils are used for adulterating purposes. 



Fig. 18. — Histology of Mallow Leaf. — i. Transverse section of leaf showing 

 stellate trichome, epidermal, palisade and spongy tissue cells. Aggregate crystals 

 of calcium o.xalate are present. 2. Stellate or aggregate trichomes. 3. Epidermal 

 cells (lower) showing stomata. Mallow leaves are extensively employed for adul- 

 terating leafy spices and drugs. 



Fig. 19. — Histology of Corn. — i. Corn starch. 2. Starch-bearing endosperm 

 of corn kernel. 3. Trichomes of the chaff of the corn cob. 4. Sclerenchymatous 

 cells of the corn cob. Ground corn cobs are used for adulterating purposes and 

 also in the manufacture of artificial maple syrup flavor. 



Fig. 20. — A Few Types of Trichomes. — i. Branching trichome of mullein. 2. 

 Many-celled simple trichome of henbane showing wart-like marking on outer surface. 

 3. Simple single-celled trichome as of rye and wheat. 4. Glandular trichome with 

 two secreting cells. 5. Glandular trichome with one secreting cell. 6. Many- 

 celled glandular trichome. 7. Simple, single-celled trichome of Indian hemp. 8. 

 Much elongated and twisted single-celled trichome, as of sage. 9. Sessile glandular 

 trichome (Eriodictyon). 10. Indian hemp. 11. Pyrethrum. 12. Simple trichome. 



