DR. J. D. HOOKER ON WELWITSCHIA. 43 
Fig. 10. Stamens and enclosed ovule. 
Fig. 11. The same laid open, showing the position of the ovule. 
Fig. 12. Summit of filament and anther. 
Fig. 13. Pollen-grains, magnified about 240 diameters. 
Fig. 14. Ovule, with the lower part of the integument removed in front, exposing the nucleus. 
Fig. 15. Tissue of the integument of the ovule. 
Fig. 16. Transverse section of the nucleus of the ovule, showing a dark line occupying the position of 
the embryo-sac in the ovule of the female flower. 
Fig. 17. س‎ of the scale of the cone and floral whorls. 
(All the above magnified, except fig. 1:) 
PrATE VII. Female cones (p. 24) and fruits (p. 37). 
Fig. 1. Branch of the panicle, sent by Mr. Baines, of the natural size. 
Fig. 2. Scale and pericarp, containing a nearly ripe seed, of the natural size. 
Fig. 3. Pericarp, with the styliform apex of the integument of the seed protruding at the top. 
Fig. 4. Transverse section of pericarp and seed. 
Fig. 5. Portion of wing of apex of pericarp, and of styliform process of integument of the seed. 
Fig. 6. Portion of wall of the cavity of the pericarp, showing the cottony liber-cells. 
Fig. 7. Very highly magnified view of wing, showing the tortuous course of the liber-cells. 
Fig. 8. Spicular cells from wall of cavity of pericarp. 
Figs. 9 & 10. Spirally marked cells from cavity of pericarp. 
Figs. 11 & 12. Liber-cells from cavity of pericarp. 
Fig. 13. Ripe seed, and base of pericarp to which it is attached, showing the ramifications of vascular 
bundles in its walls. 
Fig. 14. Longitudinal section of seed, showing the calyptriform integument at its apex, the only other 
integument being the nucleus terminating upwards in its fleshy cone. The obovoid mass in 
the interior is the albumen, crowned by the coiled-up suspensor. 
Fig. 15. Longitudinal section of the albumen, showing the embryo with its suspensor still attached to 
the cone of the nucleus above. 
Fig. 16. Two views of the embryo. 
Fig. 17. Transverse section of the styliform process of the outer coat of the seed, showing the thickened 
inner walls of the innermost layer of cells. 
(All the above, except figs, 1 & 2, are more or less magnified.) 
PuatE VIII. Development of female flower (p. 25) and scales of cone (p. 24). 
Fig. 1. Rachis of cone of female flower, with the uppermost scales remaining, of the natural size. 
Figs. 2 & 3. Two of the upper scales, also of the natural size, with an advanced female flower in each. 
Fig. 4. View of a young scale (as viewed from the rachis), with the female flower seated on a conical pro- 
minence of the rachis, which is confluent with the base of the scale, and removed with it. 
Fig. 5. Back view of the same scale. 
Fig. 6. Very young female flower, the wings developing on the perianth, and the integument of the ovule 
overtopping the nucleus, as seen by transmitted light. 
Fig. 7. More advanced flower, with the embryo-sac distinctly seen. 
Fig. 8. More advanced flower on its conical receptacle. 
Figs. 9 & 10. Female flowers at the period when changes commence in the embryo-sac. 
Fig. 11. Apex of perianth, showing the anticous position of its mouth (towards the scale). 
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