122 
SEEDLING STRUCTURE IN THE LEGUMINO&A. 
PLATE 8. 
Figs. 94, 95. Scorpiurus sulcata. 94, just below collet; 95, just above collet. 
96, 97. Hedysarum coronarium. 96, half-way up hypocotyl; 97, cotyledon tube 
and first leaf. 
105, Pisum sativum. T.S. of the central cylinder of the axis at the departure 
of the first bract-like leaf. (Cf. Pl. 9. fig. 104.) Shows (from above 
downwards) the median bundle of the second leaf, the “ medullary xylem” 
formed by the fusion of two lateral “faisceaux réparateurs," and the other 
two lateral bundles which have separated, leaving a pith between; also the 
gap in the endodermis through which the first median leaf-trace has passed 
out, 
106-108. Vicia Faba. Diagrams illustrating the behaviour of the vascular strands 
in: fig. 106, tetrarch; 107, pentarch; and 108, hexarch seedlings. For 
explanation, see text, p. 57. 
109. Phaseolus Hernandesit. T.S. of the median bundle of a primordial leaf in the 
base of the first epicotyledonary internode; showing double structure of the 
xylem. 
110,111. Voandzeta subterranea. 110 & 111 show the fate of the five xylem 
strands in a pentarch seedling. | 
PLATE 9. 
Figs. 98-104. Pisum sativum, Diagrams representing the course of the vascular strands 
in a series of transverse sections. The conventions and letters used are 
somewhat different to those in other diagrams; for explanation, see text, 
p. 5б. 
Botany School, Cambridge, 
August 1911. 
