292 STUDIES IN PLANT REGENERATION 
see if a better food supply could induce the production of shoots ; 
but these organs did not develop. 
Of a large variety of phyllodia, leaf-thorns, leaf-tendrils and 
pitchers planted, only Acacia pycnantha yielded positive results. 
Experiment 40. — Из phyllodia used as cuttings rooted with 
great apparent difficulty after seven months, and subsequently de- 
cayed without further regeneration. 
A modified leaf of a different type is represented by the bulb- 
scale. The method of multiplying hyacinth-bulbs by cutting off 
the base and allowing the separate scales to regenerate, has long 
been practiced by the Dutch bulb growers.* Lilium tigrinum has 
been found by Beyerinck { to have the same faculty. Other bulbs 
tried — tulip, oxalis, daffodil — did not exhibit this power. The 
scales of the hyacinth do not themselves root, but the bud, shortly 
after it is formed, develops a root of its own. 
Experiment 41.-- Scales of the onion bulb, on the other hand, 
produced roots with little difficulty, but never gave rise to any 
buds. In one case an onion gave a very deceptive appearance of 
rooting from the apex of the scales, as well as from the base. A 
closer examination, however, showed that the roots had arisen 
from the base, as usual, but had pushed their way up between the 
inner epidermis and the mesophyll of the scales emerging at the 
top. 
As an addition to the number of plants in which shoot buds 
can be induced to form while the leaf is still on the plant may be 
mentioned Sedum tortuosum. This leaf has no preformed rudi- 
ments, but can, when removed, form root and shoot in the normal 
manner at the base. A transverse cut had been accidentally made 
in the middle of a blade, and when the plant first attracted notice, 
it had formed a bud at the cut. 
Experiment 42. — Similar wounds were made, experimentally, 
and in several cases the bud appeared (Fig. 11). In some, root 
rudiments were visible on the lower surface, but their development 
was suppressed by the dryness of the air. Other types of cuts — 
is *Fortune, R. A Visit to the Bulb Farms of Haarlem. Gard. Chron. 556. 
3. 
erinck, 
(Reviewed in Bot. Centralb. 14: 112. 
M. W. Over het ontstaan van Knoppen en Wortels uit bladen. 
83.) 
