EXPLANATION OF THE PLATES. 
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Fig. 10. a, Stellate hairs from the leaf of a species of Hibiscus; h, a scale of the 
calyx of Elaeagnus 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. 
Fig. 13. Deep columnar cellules, with parallel fibres, from the endothecium of 
Cal la cEthiopica, the top of each cell being flat ; after Purkinje. 
Fig. 14. Arched fibres, connected by a membrane, in the endothecium of Nym- 
phaaa alba ; after Purkinje. 
Fig. 15. Flat oval cellules, with marginal incisions, in the endothecium of 
Phlomis fruticosa ; after Purkinje. 
Fig. 16. One of the elastic fibres upon the testa of Collomia linearis, unrolled 
spirally, and lying within its mucous sheath ; magnified 500 times. 
Fig. 17. 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. 18. Convex membranes, with lateral radiating fibres, forming together im- 
perfect cells, in the endothecium Of Veronica perfoliata; after Purkinje. 
Fig. 1 9. Radiating fibres, in the place of cellules, in the endothecium of Polygala 
Chamaebuxus ; 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 ; 6 shows that the pits are sometimes depressions without 
any thing 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 ; 6, 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 sur- 
face is marked by concentric circles. 
Fig. 7. A front view of a coniferous gland, partially covered by the matter of 
lignification. 
Fig. 8. A profile view^ of the same. 
Fig. 9. A simple or one-threaded spiral vessel, partly unrolled, with its ter- 
mination. 
Fig. 10. A bent portion of the spire of the latter, to show that elementary fibre 
is cylindrical. 
Fig. 11. A compound or many-threaded spiral vessel, partly unrolled, with its 
terminations. 
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