l62 



Uniseriate epidermal and hvpodermal cells bound the palisade parenchyma. 



The parenchymatous empty cells and those staining a dark brown colour, — 

 the manganese compound, form a band enclosing the bundles of the stele, and 

 do not always extend around the oil ca\Tities, which have \'ery distinct elongated 

 guard and secretory cells. 



The bundle of the loaf has the usual complement of transfusion tissue, but 

 no sclerenchymatous cells were seen. 



The transpiratory surface is quite ventral, the stomata having the usual 

 elongated cuticle cells, described under C. g/auca and other species. 



Figure c,6 is a transverse section through mid-distance of the two nodes of 

 a branchlet showing the axil bundles and dissected decurrent leaves. Although 

 the section was, perhaps, a little too thick to determine the outer details distinctly, 

 yet the darker staining brings out the palisade parenchyma, backed by a single row of 

 hypodermal cells, which in turn are supported by those of the epidermis, the whole 

 showing an assimilatory dorsal wall out of all proportion to that of the transpira- 

 tory one, which in this illustration shows the elongated cuticle cells or projections. 

 The remaining features are described above. Figure 97 whilst illustrating three 

 oil ca\-ities — one in each leaf — determines also the position from which the section 

 is taken, i.e., near the diverging of the free ends of the leaves. The cell forma- 

 tion of the mesophyll surrounding the oil reser^'oirs is well characterised here and 

 is quite specific. The leaf trace next to each oil cavity is distinctly seen as well 

 as the character of the surrounding cells. Figure gS. — This enlargement (190) 

 brings out fairly well the detail structure of the central axis of the branchlets 

 with its three bundles, each with its xylem and phloem and the pith or vessels 

 with their three medullary branches. The bundle of each individual leaf is well 

 seen just below an oil reser\-oir — the circular spaces being not quite wholly shown 

 in the picture. This plate also shows the normal orientation of all these vascular 

 bundles. The three wcdged-shaped spaces are the lower parts of the ventral 

 surfaces of the leaf, and show where the decurrent leaves join, and with the central 

 axis form one whole living portion of the tree. The coloured and empty paren- 

 chymatous cells form a distinguishing feature, whilst on each side of the leaf 

 bundle can be seen the transfusion cells — marked by the small circles (bordered 

 pits; in them — arranged crescent shape, concentric with the lower curve of the 

 oil cavities. Figure 99 gives a longitudinal section through the base and top of 

 two leaves, showing in the case of the latter their free portions, and also how these 

 particular parts form only a small fraction of these organs. The leaf on the lower 

 left side has an oil reservoir, to the right of which is seen tlie bundle of that leaf — 

 the light shaded portion, curved at the to]) trj the left. Figure 100 shows 

 the structure surrounding this oil cavity further magnified to 160 diameters, the 

 right half of the picture giving a portion of the leaf bundle and central axis. The 



