PLate LV.— 
Puate V.-— 
Cc. A. BARBER. 43 
Note especially the “shadow” of starchy cells, b, the oval light- 
coloured nucleus and the dark median shadow of the gland, 
d, 2d, a portion of such a stage of the gland further magnified. 
2d!, a similar section from another, slightly older gland. 
The cells of the gland are elongated horizontally. 
Four stages in the development of the gland. Fig. 1 shows a 
stage connected with those on Plate ITI. At é the cells of 
a small triangular area on each side become charged with 
starch, The oval area of Plate III is thus separated into two 
parts, an upper, the vascular loop, and a lower, the nucleus 
proper. 
After the stage shown in fig. 2, no definite structure can be seen 
in the lumen of the gland. Figs. 2a and 2b show portions of 
such a stage magnified further. At « is the bed of the 
secreting cells which form a cap round the upper part of the 
gland, In fig. 3 the lower part is lobed, while in fig. 4 the 
gland is mature and the cells of the upper part of the nucleus 
have commenced actively dividing so as to press the gland 
downwards. Note the duct d. 
A change may be observed in these figures in the position of the 
densest, starch-filled tissue of the cortex, which is found 
further in in succeeding stages until it is met by the zone of 
clear cells. The line of demarcation between the outer and 
inner parts of the cortex becomes more and more distinct 
until, when the gland is mature, it is exceedingly sharp. 
Transverse section through a haustorium attached to a root of Melia 
Azidarachta, with a mature gland. The stage is similar to that 
in fig. 4 of the last Plate. Detailed drawings are added of the 
various parts. Fig. a shows the junction of nuclear and 
cortical cells at the top on one side, the cortical cells being 
filled with starch and those of the nucleus with protoplasmic 
contents. In fig. b the line of separation between the starchy 
and clear cells of the cortex is shown. The median shadow of 
the upper part of the nucleus is drawn in fig. ¢ together with 
a few tracheides forming the base of the vascular loop, and 
the upper part of the cap of the gland. Fig. d shows the 
duct and fig. e some of the more distinct cells at the edge of 
the lumen in the lower part of the gland. 
