OF THE LEAVES OF CERTAIN SPECIES OF VERONICA. 273 
development both with regard to the highly modified forms and those that 
are less so. 
Goebel * considers that in the * whip-cord ” forms the reduced leaf really 
represents only the leaf-sheath, and that the lamina is represented by the stiff 
points seen, for example, in V. lycopodioides. Consideration of seedlings and 
of the “ reverted” form of leaf certainly tends to confirm this view. Again, 
the arrangement of the vascular bundles in the “leaf” of these forms, 
e. g. V. Hectori, is practically identical with that of the vagina in the less 
modified species. 
The cork developed at the leaf-base seems to be formed abnormally early, 
in preparation for the fall of the leaf. The absciss-layer is just above the 
patch of cork-cells. The patch arises just as that below an ordinary abseiss- 
layer t, and only differs in amount and its time of production. 
In conclusion, I desire to express my sincere thanks to Professor Seward 
and to Mr. A. G. Tansley, for their kind help and suggestions during the 
progress of this investigation. 
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Curtis, W., and others. Botanical Magazine; several plates from 1844 onward. 
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—— Ueber die Jugenzustünde der Pflanzen. Flora, lxxii., 1889, pp. 1-45. 
— Organography of Plants. Part I. Engl ed. Oxford, 1900, pp. 167, 172. 
Einleitung in der experimentelle Morphologie der Pflanzen. Leipsig, 1908, p. 31. 
HanBERLANDT, б. Vergleichende Anatomie des assimilatorischen Gewebssystems der 
Pflanzen. Prings. Jahrb. f. Wiss. Bot. xiii., 1882, p. 74. 
—— Ueber Bau und Function der Hydathoden. Berichte d. Deut. Bot. Ges. xii., 1894, 
р. 367. 
——  Physiologische Pflanzenanatomie. 4th Aufl, Leipsig, 1909, p. 447. 
HanseirG, А. Phyllobiologie. Leipzig, 1903, p. 84. 
Herriort, Miss E. M. On the Leaf-Structure of some Plants from the Southern Island 
of New Zealand. Trans, N.Z. Instit. xxxviii., 1905, p. 377. 
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* Goebel (1900). t Massart (1898). 
