PLATE 21. Hairs, Fibres, Glands, &c. of Plants. 



Figure 



1. Cotton. 0, normal condition ; b, portion treated with sulphuric acid and iodine ; 



c, a fragment of gun-cotton. 



2. Flax, a, normal fibre ; b, portion boiled with nitric acid ; c, treated with nitric 



acid, and afterwards with sulphuric acid and iodine. 



3. Jute. a, normal fibre ; b, c, portions boiled with nitric acid. 



4. Coir (Cocoa-nut fibre), bundle of fibres. 



5. Ditto. a, by portions of fibres boiled with nitric acid. 



6. Hemp. , normal fibre ; 5, portions boiled with nitric acid. 



7. Manilla hemp. , normal fibres ; b, fragment boiled with nitric acid. 



8. Sting of TJrtica urens. 



9. Surface of the cuticle of Helleborusfcetidus. 



10. Ditto of Cakile americana. 



11. Imbedded gland of Ruta graveolens, vertical section. 



12. Glands of Magnolia, seen from above. 



13. Hair of Siphocampylus bicolor, the cuticle detached by sulphuric acid. 



14. Glands of hop. a, side view ; b, from above. 



15. Stellate body from the air-spaces in the leaf of Nuphar lutea. 



16. Hair of Delphinium pinnattfidum. 17. Hair of Anchusa crispa. 



18. Hair of Pelargonium. 19. Branched hair of Ferbascum Thapsus. 



20. Scale-like hairs from the seed of Cobcea scandens. 



21. Annulated hairs from the seed of Ruellia formosa, in water; 5, detached cell-wall. 



22. Spiral-fibrous hairs from the seed of Collomia grandiflora, in water. 6, c, frag- 



ments showing the cell-wall and free fibre. 



23. Hair from the seed of a Salvia. 



24. Hair from the seed of Acanthodium spicatum. b, a fragment of a branch. 



25. Chinese grass-cloth fibre, a, normal fibre ; 6, fragments boiled with nitric acid; 



c, afterwards treated with sulphuric acid and iodine. 



26. Puya fibre. , normal fibre ; b, fragments boiled with nitric acid ; c, afterwards 



treated with sulphuric acid and iodine. 

 26*. Stellate hairs from the epidermis of Deutzia scabra. 



27. Stellate hair of ivy-leaf. 28. Stellate hair of Alyssum. 



29. Horizontal stalked hair of Grevillea lithidophylla. 



30. T-shaped hair of garden Chrysanthemum. 



31. Ramentum or scale from a germinating fern. 



32. Hair from the bulbel of Achimenes. 



33. Hair from the corolla of Digitalis purpurea. 



34. Hair from the corolla of Antirrhinum majus, 



35. Branched hair from the epidermis of Sisymbrium Sophia. 



36. Forked hair from Capsella Bursa-pastoris. 



37. Branched hair of Alternanthera axillaris. 



38. Gland of Dictamnus Fraxinella. 



39. Epidermis of Dictamnus Fraxinella. a, b, hairs ; c, gland vertically divided. 



40. Glandular hair of Lysimachia vulgaris. 



41. Glandular hair of Scrophularia nodosa. 



42. Glandular hair of Bryonia alba. 



43. Scale of Begonia platanifolia. 



44. Glandular hair of Gilia tricolor. 



45. Vertical section of papilla of Mesembryanthemum crystallinum. 



46. Seta of a rose. 



47. Tufted hairs of Marrubium creticum. 



