391 



of Dorstenia, showing the cellular base from which it arises, and that it 



consists of a single hollow conical curved cell. 



Fifj. 9. A branched hair from the cilia of the leaf of a species of Verbascum. 

 Fig. A. A simple coloured hair in Dichorizandra rufa. 

 Fig. B. A hair with tumid articulations from the leaf of Gesneria tuberosa. 

 Fig. 10. a, Stellate hairs from the leaf of a species of Hibiscus ; b, a scale of the 



calyx of Eleeagnus argentea ; c, a hair of Chrysophyllum Cainito. 

 Fig. 11. Reticulated cellular tissue from the testa of Maurandya Barclayana. 

 Fig. 12. Spiral oblong cellules lying among the parenchyma of the leaf of 



Oncidium altissimum. 

 Fir/. \ 3. Deep columnar cellules, with parallel fibres, from the endothecium of 



Calla aethiopica, the top of each cell being flat ; after Purkinje. 

 Fig. 14. Arched fibres, connected by a membrane, in the endothecium of 



Nymphsea alba ; after Purkinje. 

 Fig. 15. Flat oval cellules, with marginal incisions, in the endothecium of 



Phlomis fruticosa ; after Purkinje. 

 Fig. 1 6. One of the elastic fibres upon the testa of Collomia linearis, unrolled 



spirally, and lying within its mucous sheath : magnified 500 times. 

 Fig. 1 7. A part of one of the elaters of a Jungermannia, showing a broad spiral 



fibre loosely twisted inside a transparent tubular membrane, with a dilated 



thickened mouth. 

 Fig. Itt. Convex membranes, with lateral radiating fibres, forming together 



imperfect cells, in the endothecium of Veronica perfoliata ; after Purkinje. 

 Fly. 1 9. Radiating fibres, in the place of cellules, in the endothecium of Polygala 



Chamsebuxus ; after Purkinje. 

 Fig. 20. Prismatical depressed cells, with straight fibres on the walls, from the 



endothecium of Polygala speciosa ; after Purkinje. 



PLATE II. 



Fig. 1 . A section of pitted cellular tissue, showing on one side the matter of 

 lignification separate from the elementary membrane ; in the lines where 

 the cells unite this is not shown, the membrane being so thin as to be 

 inappreciable : a a a are pits in the sides of cells, corresponding with similar 

 pits in the neighbouring cells ; b shows that the pits are sometimes 

 depressions without anything to answer to them on the opposite side. 



Fig. 2. An ideal figure of part of a tube of bothrenchyma, showing that the 

 apparent holes are mere pits in the interior. 



Fig. 3. A section of coniferous wood : a, glandular pleurenchyma ; b, spiral 

 vessels ; c, prismatical parenchyma, containing chlorophyll. 



Fig. 4. A transverse section of two complete tubes of glandular pleurenchyma, 

 to show that the glands are thin spaces in the sides of contiguous tubes, 

 through which light passes in the direction of a a. 



Fig. 5. A front view of coniferous glands in a young state. 



Fig. 6. A very highly magnified view of such glands, showing that their surface 

 is marked by concentric circles. 



Fig. 7. A front view of a coniferous gland, partially covered by the matter of 

 lignification. 



