44 



is more distinctly seen and consists of three bundles, and the empty spaces are oil 

 ca\'itie5 cut at varxnng angles. Figure 7 shows portion of a transverse section cut 

 clear of the central axis and just below the columella. The ring of bundles can just 

 be seen in the centre of the picture, while others may be observed in the sporophyll 

 tissue and denoted by the dark spots (transverse) and dark radial lines (obliquely 

 cut). Figure 8 is a 32-magnilication of the upper portion of Figure 7 ; the bundles 

 are more distinctly seen, and the row^ of oil cavities on the dorsal surface form 

 a conspicuous feature. In Figure g is given a cross section a little higher up 

 than the last figure and through the columella. Two of the three larger valves 

 are in the field of vision, and also two of the smaller \ahes, onh' portions of the 

 other two being seen. Cross sections of a few z^-gotes are shown at the base of 

 the scales, the darker spots denoting the bundles, and the spaces in the leaf tissue 

 are empty oil cavities on the dorsal and ventral surfaces. Figure 10 gives a view 

 of a section just clear of the columella. Two large and two small valves are perfect. 

 In Figures 11 to 15 these cross sections ha^•e been taken at various intervals above 

 the last and below the dome. The dorsal oil cavities are specially well defined, the 

 ventral caxnties being less conspicuous, the dark spots in the sporophyll tissue are 

 the bundles, whilst the irregularh-shaped bodies in the middle seed cavity are 

 the cross sections of the maturing seeds or z\-gotes. Figure 16 is a cross section 

 at the base of the early cone of C. Macleayana and shows the attachment of the 

 valves to the central axis, — surrounded in this case by some proportionately larger 

 oil caWties, and a row of these bodies occurs just below the dorsal surfaces of 

 the six alternate cone valves, and separated by radial slits or sections of the ventral 

 channels. Figure 17 shows a 55-magnification of the surrounding tissue of an 

 individual \Tntral decurrent channel between two valves. It is interesting as 

 illustrating how the papillose projections surrounding the stomata interlock like 

 the teeth of a cog-wheel as the valves come together to form the cavity for 

 maturing seeds ; oil cavities are seen to be numerous, as well as the sporophjdl 

 tissue consisting also in these parts of starch-filled cells (not seen in plate) and the 

 filled parenchymatous cells. Figures 18-24 '^^t' longitudinal sections of a fruit 

 cone in its early stage, soon after the closing over of the thickened portion of 

 the sporophylls. Figure 18 shows the dome with one spur on a scale, and also 

 the ventral oil cavities with their subtending bundles the black markings). In 

 Figure 19 is given a 13-magnification of a longitudinal section just clear of the 

 spurs. Figure 20 is taken from a larger stage of growth, and three fertilised ovules 

 are well defined standing erect in the central cavity, doiiicd l)\- the enlarged 

 portion of the sporophyll — the lower surface of which is lined with oil cavities, 

 and near which are bundles differing in shape owing to the obliquity of the various 

 angles of section. Figure 21 is a longitudinal section of a fruit cone through the 

 columella, showing fertilised and sterile ovules, and Figure 22 is a higher magni- 

 fication through these latter organs, which are seen to be similar in structure to the 

 sporophyll tissue, so that Figure 22 is the enlarged centre ol 11. Figures 23 and 24 



