
Figure 18. 
Figure 19. 
Figure 20. 
| Figure 21. 
| Figure 22. 
Figure 23. 
| Figure 24. 
| Figure 25. 
TROPHOLUM PEREGRINUM AND T. SPECIOSUM. 235 
Tropewolum majus. 
Sketches, A after Hormersrer (“Die Entstehung des Embryo der Phanerogamen,” 1849, tab. 
v. fig. 22); B and C, after Scacur (Bot. Zeit. 1855, tab. ix. figs. 8 and 9). Showing very 
young germs exhibiting the soda-water bottle form. In A, the pollen tube (tp) is seen 
passing through the micropyle. 
Outline figure of considerably further advanced germ of same. The pointed base is dis- 
tinctly seen, and the extra-seminal and placental root-processes, the suspensor and the 
“embryonal globule,” are all distinctly differentiated. 
Tropeolum peregrinum. 
Similar outline figure of germ where the parts corresponding to those in the last are easily 
recognised, though the proportions are somewhat different. 
Puate XVI. 
Tropeolum peregrinum. 
Longitudinal mesial section of young fruit-lobe, showing embryo, suspensor, and the extra- 
seminal and placental root-processes. The extra-seminal root-process, after boring through 
the seed-coat, runs a short distance in the cavity of the seed-vessel, and then penetrates 
the substance of the carpel a little above its upper third, thereafter running an obliquely 
outward and downward course in its substance. 
Similar section at a much more advanced stage. Extra-seminal process much elongated and 
pursuing a very obliquely outward course in the substance of the carpel. Cotyledons 
now of considerable size. Placental root-process and base of suspensor not seen in the 
section. 
Tropeolum majus. 
Abnormality. Section of young fruit-lobe, showing the extra-seminal process, instead of 
running its whole course free in the cavity of the seed-vessel, insinuating its extremity 
into the substance of the carpel at a point corresponding to the chalazal or lower end of 
the seed. 
Photolithographic reproduction (somewhat reduced) of Wu1son’s figure of a similar abnor- 
mality. Here the fruit-lobe is at a somewhat more advanced stage of development than 
in the last, but otherwise the cases are identical. 
Tropeolum speciosum. 
Abnormal flowers, showing supernumerary spurs, slightly over natural size. See Appendix. 
Dracocephalum peltatum. 
. Constructed after figures by TuLasnz (“Annales des Sc. Nat.” 4° sér. t. iv. tab. iv. figs. 
4,5, and 9.) Section of young fruit-lobe, showing embryo-sac with cecal dilatations (ce), 
which presumably have the function of absorbing nutritive material for behoof of the 
developing embryo. a, point of application of pollen-tube to embryo-sac, indicated by 
TuLASNE (with a query) as the apex of the sac. 
VOL. XXVII. PART II. 3 P 
