EXPLANATION OF THE PLATES. 
553 
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 
Calla sethiopica ; the top of each cell being flat ; after Purkinje. 
Fig. 14. Arched fibres connected by a membrane in the endothecium of Nyra- 
phsea alba ; after Purkinje. 
Fig. 15. Flatoval cellules, with marginal incisions, in the endothecium of Phlomis 
fruticosa; after Purkinje. 
Fig. 16. One of the clastic 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. 1 8. Convex membranes, with lateral radiating fibres, forming together im- 
perfect cells ; in the endothecium of Veronica perfoliata ; after Purkinje. 
Fig. 19. 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. Common woody tissue; a, slightly magnified; very highly magnified, 
and shown as seen by transmitted light ; the extremities only are seen : c, cel- 
lular tissue. 
Fig. 2. Woody tissue from the leaf of Oncidium altissimum, from a preparation 
by Mr. Griffith. In this there are small tubercles growing from the surface of 
some of the fibres, irregularly, or arranged in a spiral direction ; a, is magnified 
180 times ; at 6, which is magnified 350 times, the form of the tubercles is more 
distinctly shown ; and it is seen that small granules are contained within 
the fibre. 
Fig. 3. The dotted ducts of Zamia horrida. The little oval spaces that have 
been supposed to be holes, arc shown to be opaque ; most of them are oblique; 
but some of them are exactly transverse, rounder, and have a distinct line 
passing through their longer axis. 
Fig. 4. Woody tissue from the stem of Calycanthus floridus : in this the sides 
of the tubes are marked with small oval dots, exactly as in Zamia. 
Fig. 5. A minute portion of a section of the wood of a species of Gnetum from 
Tavoy ; a, woody tissue, filled with loose and rather angular particles of greenish 
matter ; b, glandular woody tissue, showing its large size in proportion to the 
other, and the appearance of its glands. 
Fig. G. A vertical radiant section of the wood of yew, magnified 250 times; 
after Kieser ; showing what he calls the spiral porous cells. The spires vary 
from one to four in each cell ; and the glands, when present, are always situated 
between the spires, as at a, b, e, and g. Some of the cellules have no glands, 
as c, (Z,y*, h, i. The yew has true spiral vessels besides these. 
Fig. 7. A small portiju of a vessel in the wood of an Ephedra from Chili, 
