596 MISS M. G. SYKES ON THE SEEDLING AND | 
At a level very little below the area of disturbance the two roots formed at this third 
attempt are found to be nearly of the same size and to have quite normal diarch structure 
(text-fig. 2, G). 
There is one point of some interest shown in this figure which may be referred to here: 
a small mass of lignified elements, generally much stretched and ruptured, is seen on the 
Fig. 2. 
Fig. 2, A-G.—A series of transverse sections through th 
(secondary xylem — 
e bifurcating root of the seedling shown in Pl. 34. fig.1 
shaded, primary xylem = black, dotted area — fibres (f), phloem outlined). 
outer side of each of the protoxylem groups, separated from it by several layers of paren- 
chymatous cells (Pl. 35. fig. 14). In text-fig. 2, G, these elements are very few in number, 
but in some cases they form a very considerable group and are often arranged 1n 
a triangle having its apex directed towards the apex of the triangle formed by the 
protoxylem of the main group. In such cases there is little doubt that the protoxylem 
