286 SVEDELIUS : LIFE-HISTORY OF 
to discover whether perhaps its internal structure might 
provide any explanation of this phenomenon. Already at 
an early stage the anatomical structure of the pedicel is 
somewhat monoBymmetrical (c/. Muller, 21, tab. 3, fig. 23). 
Besides the central larger vascular bundle there is also a 
smaller one close by, making the transverse section more or 
less monoBymmetrical. If thegrowth of these two bundles 
is different, *>., if one still increases after the growth of the 
other has already stopped, the result might be a coiling of 
the pedicel. 
Enalus also has a somewhat monosymmetrical strnctnre 
of the female pedicel, especially at the place where the 
closest spiral forms. For comparison it is also of interest to 
know the structure of the pedicel of the male inflorescence. 
Fig. 1, PI. XXIV., B shows a transverse section through the 
male pedicel. Under the epidermis there are a few cell 
layers (2-3) which fit closely together without any air 
chambers. Within these the tissue is very full of air, with 
a lot of lacunae separated by single cell layers. The vascular 
system is represented by two bundles of the same size in the 
middle and also a few other very small ones at the periphery. 
Thus the structure is bisymmetrical. The vessels in the 
bundle are few and small. There are also some tannin cells 
in the tissue, but not many. The pedicel of the male 
inflorescence has the same structure throughout its whole 
length and also during its whole life. The female pedicel 
(PI. XXIV. B, 2-3) on the contrary has a rather different 
structure. Its structure during a later stage differs somewhat 
from its structure during an earlier stage, and also differs in 
different parts. In the female pedicel the coherent cell 
layers under the epidermis are more developed, while the air 
chambers are few, but the vascular bundles are rather large 
and numerous. But just as in the male pedicel, there are 
two vascular bundles in the middle, much larger than the 
rest- At the base of the pedicel they are also of about the 
same size as the air chambers around them. But higher up 
