C. A. BARBER. Pees 
the base of the vascular loop, and the latter extends upwards, widely 
open, through the transitional region towards the mother root. 
The region of the cortex with denser starch contents has in 
the section become narrower, the outer and inner cells of the 
radiating rows having become clear and devoid of contents. 
13. The poimts referred to in the latter part of the pre- 
ceding paragraph are more clearly brought out in the young 
haustorium figured on Plate VIII, entering a root of Albizzia 
Lebbek. Although the haustorium is still very young, the gland 
has completely disappeared, nor is the zone of clear cells certainly 
traceable without the aid of the section last described. In other 
respects this section is more regular than the last and shows the 
ordinary course of the haustorial development better. The root 
invaded is that of a dicotyledon and shows the sucker lobes pass- 
ing on each side along the cambial line and throwing back the 
two cortical wings of the host’s root. The vascular strand is 
simple, no secondary thickening having taken place. The tissues 
derived from the nucleus are sharply marked off from those 
of the cortex, being separated by collapsed layers or being 
readily distinguishable from the nature of their own contents 
(figs. 1 and 2). 
The lower part of the collapsed layer curves abruptly inwards 
round the ends of the cortical wings of the host. This inward 
projection is of constant occurrence and is difficult to explain. 
As we shall see later on in this paragraph, it is probably derived 
from nuclear tissue and corresponds with the small bay of clear 
cells marked d in figure 2 of Plate VI. Whatever its origin, it 
undergoes no further development, but the part of the collapsed 
layer below it still increases in thickness, receiving accessions of 
crushed cells both from the zone of clear cells within and from 
the cortical cells outside it (fig. 3). Such cortical cells as are 
about to be added to the collapsed layer can be readily traced by 
their almost total lack of contents. The first change that 
appears in them is the breaking up of the starch grains into very 
fine particles and these, later on, disappear entirely. The cell walls 
