413 
Arum maculatum from the Seed . 
groups would represent three primitive bundles belonging to 
the cotyledon, two of which branch immediately on entering 
the first internode. Thus the symmetry of the root-structure 
would be immediately derived from that of the cotyledon. 
The anomalies just described show, however, that one of the 
plumular bundles may occasionally exercise some influence 
on the root-structure. We hope to obtain some light on 
this point from the examination of seedlings belonging to 
allied genera. 
EXPLANATION OF FIGURES IN PLATE XXV. 
Illustrating Mrs. Scott’s and Miss Sargant’s paper on Arum maculatum. 
Abbreviations : s., seed ; t., tuber ; s. scale-leaf ; r., root ; c. r., contractile 
root ; A, bud. 
Fig. i. Arum maculatum. 
Fig- 2. „ 
Fig- 3- „ 
Fig- 4- 
Fig. 5- » » 
Fig. 6. „ „ 
Fig. 7- » » 
Fig. 8. „ „ 
Fig. 9- » „ 
Fig. io „ 
Seedling. Jan. 29, 1896. 
„ Showing the tuber, radicle, and root- 
hairs. 
„ A little more advanced. April, 1896. 
,, Showing tuber much enlarged. May 7, 
1896. 
June 9, 1896. The seed-coats and cotyledon have 
been cut off by periderm. 
Oct. 14, 1896. The radicle has shrivelled and new 
roots have been formed. 
Young plant third season. 
June 9, 1898. Young plant fourth season, showing 
two contractile roots. 
Section through petiole of the innermost leaf of 
mature plant (Fig. 10), showing the inflorescence 
enclosed in it and the next year’s vegetative 
bud (£). 
Mature plant with vegetatively produced young 
plant ( A ) attached, and numerous tubers about to 
form new plants. 
Figs. 11, 12, 13. Diagrams illustrating the course of the bundles in the epicotyle 
donary stem of a seedling about the age shown in Fig. 4. 
1-4, Cotyledonary traces. 
A-C, Traces from first leaf. 
a, &, 7, Traces from second leaf. 
I, Mid-rib of third leaf. 
