Pirate VIII.— 
Pirate [X,— 
Figs. 
C. A. BARBER. 45 
sort the manner in which penetration takes place in the first 
instance. The cambium, c, with the layer of phléem, ph, 
outside it, has been destroyed opposite the point of attack, but 
the host’s root has developed a protective layer of cork, ch, at 
this point in place of the phloem. 
1 to 3. Transverse section through a young haustorium 
which has penetrated a root of Albizzia Lebbek. The sucker is 
lobed and follows the line of the cambium in the host’s root. 
Portions are magnified further in figures 2 and 3. 
Note in fig. 2, a, the cells of the upper part of the nucleus which 
Fig. 
Fig. 
Fig. 
Fig. 
have become elongated in penetration, the adjoining cells of 
the cortex remaining unaltered: /ac, the lacunar region not 
very well developed in this case: 6, the nest of cells: x, the 
sharp line of separation between the starchy cells of the cortex 
and those which are about to be added to the collapsed 
layer. 
3. <A portion of the lower part of the collapsed layer. It is 
being formed by the addition of crushed cells both from the 
clear zone within and the cortical cells without, c/, clear zone 
c. 1., collapsed layers, co, cortex. 
4. A portion of one of the wings of the bark of Azima 
tetracantha, showing the comparatively slow solution of the 
starch grains, s, sucker cells, scl, sclerotic cells of the bark, sé, 
starch grains, the cell walls containing them having been 
dissolved away, ck, cork being formed on the inner face of the 
wing. st and sel are indistinct and imbedded in yellow secretion 
from the sucker cells. 
5. A portion of the woody cylinder of the same root of 
Azima tetracantha showing the persistence of the starch grains 
in a medullary ray. ss, sucker cells, v, vessel, m. 7., medullary 
ray of the host. The starch grains are lying in the yellow 
secretion after the cells which contained them have been dis- 
solved away. 
1. Transverse section through a haustorium fixed on a root of 
Capparis sp., which has developed secondary thickening. Note 
a couple of fibro-crystal masses at the top of the loop. The 
lacunar region of the nucleus is well seen, as also the nest of 
cells below the lacuna. The lower and middle parts of the 
collapsed layers are well shown as also the cells becoming clear 
for the formation of the upper part w. c. 1. Note the protective 
