464 . INTERNATIONAL GARDEN CLUB 
EXPLANATION OF PLATE 
Figures 3a to 3e are magnified 3 diameters; Figure 3/, 13 times; Figures 14 to 20 are 
purely schematic; all other figures are one-half the natural size. 
Fig. 1. Tulip plant with dropper, and two daughter lateral bulbs at old level without 
droppers. Blade of leaf removed. Surface of soil indicated. 
Fig. 2. Entire plant with dropper slit vertically showing bulb enclosed at base of 
the dropper. 
Fig. 3. View showing surface of stem portion of dropper. Upper part of leaf removed. 
Figures 3a to 3f. Cross sections of dropper shown in figure 3, taken at points indi- 
cated. Shows distribution of fibrovascular bundles. 
Fig. 4. Longitudinal section of a part of a dropper extending above and below old 
level. 
Fig. 5. Longitudinal section of base of dropper and the enclosed bulb. 
Fig. 6 and 7. View of a plant collected on March 22, showing a dropper in the early 
stages of downward growth, and also a small offset. 
Fig. 8. Same with old bulb sectioned. 
Fig. 9. Same with dropper also sectioned. 
Fig. 10. Longitudinal section of a vegetative bulb early in spring. Upper part of 
vegetative leaf removed. Base of new bulb beginning to extend beyond the upper portion 
of the old bulb. Shows the normal eccentric radial growth of stem and the position of 
the bulb in the soil. 
Fig. 11. Plant with dropper growing nearly horizontal to the surface of the soil. 
Fig. 12. Diagram of a median vertical section of a vegetative bulb at the beginning 
of a season of growth. 
Fig. 13. Same as figure 12 but at end of the season of growth. Shows relation of base 
of new bulb to stem of old bulb. Scales of old bulb are not shown. 
Fig. 14. Representing condition of concentric radial growth and with uniform elonga- 
tion of nodes (A, B and C) and internodes (a and b) most common in plants. 
Fig. 15, Representing an increase in concentric radial growth of a node (B) and of 
the adjoining parts of internodes (a and b) over that of other nodes. 
Fig. 16. Illustrating eccentric and downward radial growth of a node (B) and the 
correlated growth of the internode below. 
Fig. 17, As in figure 16, but with unequal elongation of internode below (a) which 
is greatest on the side of greatest eccentricity. This is the condition which regularly 
develops in the base of the new bulbs of vegetative tulip plants. Compare with figures 
10 and 13. 
Fig. 18. Same as in Figure 17, with also eccentric and unequal elongation of the inter- 
node (6) above. 
Fig. 19. Same as above but more pronounced. 
Fig. 20. Diagram of a young dropper of the tulip. Same as Figure 19 with also @ 
nee growth of the leaf attached to node B. Region of active growth indicated 
Fig. 21. Flowering bulb of tulip below, scale leaves attached to closely compacted 
nodes. Flower stem arising by marked symmetrical elongation of a few internodes 
(c,bandc). Green leaves attached to the nodes (A, B and C) not shown. 
