1 62 Hill. — On the Seedling- Structure of certain Piper ales. 
a single axial ovule as the primitive type for the Angiosperms, and with 
this Peperomia agrees perfectly.’ 
Thus it is obvious that in the light of recent research, more especially 
as regards questions dealing with the Phylogeny of the Angiosperms, the 
plants herein dealt with are of some importance. 
PlPERACEAE. 
Piper cornifolium , H. B. K. The basal region of each seed-leaf 
possesses one comparatively large collateral vascular bundle (Fig. i) 
which enters the petiole, when almost immediately a redistribution of 
the constituent tissues gradually takes place. The phloem is resolved 
into two masses, bounding the xylem on either side, and, at the same time, 
Diagram I. 
Illustrating the anastomoses which occur between the phloem of the cotyledon bundles C. i, C. 2, 
and the epicotyledonary strands a, b, c, d , e , and f In the cotyledon-traces the exarch protoxylem is 
bounded on each side by a group of phloem elements. 
the xylem undergoes rotation, so that the protoxylem becomes exarch, 
whilst the bundle is still within the petiole of the cotyledon (Figs. 2 and 3). 
At the cotyledonary node the bundles enter the axis and pass towards 
the centre, which, in the oldest seedling examined, possessed six bundles 
derived from the plumule. These epicotyledonary traces exercise no 
influence on the transition phenomena, and were, for the most part, still 
merismatic, one only containing lignified elements. They are arranged in 
