662 
Wars dell.— A Study of the Vascular System in 
In view of the presence of this ventral bundle, this species cannot be 
said to be so distinct in its petiolar structure from other species, as some 
authors, e.g. Plitt, has maintained. The petiolar structure of C. heracleifolia 
and C. recta is clearly transitional in character between the more primitive 
type of C. apiifolia and C. Vitalba , in which, in the typical part of the organ, 
a complete normal cylinder obtains whose bundles are all equally well 
developed, and the more advanced type of C . alpina , in which nearly, but 
not quite, all vestige of the bundles constituting the ventral part of the 
cylinder has disappeared. 
We have thus briefly studied some types from the Ranunculaceae, but 
will postpone a discussion of the results until after the study of types from 
the other orders of the group has been accomplished. 
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