64 WRIGHT: THE GENUS DIOSPTROS 
by the descending epicotyledonary trace, and thna indicated 
one of the possible stages in the establishment of a new root 
symmetry. 
Splitting of Xylan Troon .-Another point which indicates 
most markedly the nnstable conditions of the seedlings is 
seen in the splitting 0 f the xylem of the leaf traces. This is 
JUT™ ' n “ edlillgs which «ry yonng and in which 
rascal*, cambium has not made its appearance, and for the 
e of clearness a description of the behaviour in D. 
vasenlft 0 ^ 611 ^ .' 8 ^ 6re glTeIL At the cotyledonary node three 
Ze 1!°“ l m “ ke lheir exit “ «* la* and persist as 
three separate strands in the petiole of each cotyledon. At 
livZpZ °„ C °‘ yl6d0n8 ’ two the epicotyl 
thrflfi nr m ® acn xylem strand separates into two, 
Z; aa rZT At the C0,let area 1 haTe wanted as 
scattering of the origfnTeilht re9nIting fr° m the 
oollet inte the primZ'„! * Z"®' bel ° W ^ 
this takes Place het„o 810n o' 0 ”", bnt whether 
wise is vZZcnirtoTi 0l " 98imilarb ' ,ndle8 ' >ro ‘ I ‘- 
gradoailv, and ateertabn T™™' The »n 
*o be sixteen, late, twZZd te ”"1^ ° f 8trand9 ' 3 886,1 
a final four. In no s ■’ d through ei S ht and six on to 
strands in the apical ti!^ 8 ^ tilere ever less than four 
Owing to thT Mir 0 ” * th<! Prim ^ ro ot . 
elements it is often hJ 8Cattered nat «re of the xylem 
wherein the m v “nT“ le t0 exact area 
<o seedlingsIZ: ZeT^^* 8 “• 
sometimes only one lateral coZd*” * great Tariation : 
division, sometimes all three th tr&Ce under g° es 
when present may ro^^***™*^ 
