558 Thiselton-Dyer. — Morphological Notes. 
internodes lengthening almost simultaneously, or at least the 
upper strongly developing long before the latter have finished 
their growth ; and the latter are practically leafless, having 
only small and scale-like and useless rudiments of leaves. . . . 
The abortion of the earliest leaves of the plumule is in corre- 
lation with the hypogaeous situation of the cotyledons 
throughout the germination.’ 
Finally I may suggest that the anatomy of cotyledons 
affords a promising field of investigation, at present almost 
wholly unworked, which may throw much light on their 
history. 
