(32 THE TRANSVERSE SECTIONS OF PETIOLES OF EDCALYPTS 



EXPLANATION OF PLATES. 



REFERENCE LETTERS TO ALL THE FIGURES. 



b. bast. 



c. cuticle. 



cc. central canals. 

 ce. cavity of epidermal cell. 

 cp. cortical parenchyma. 

 cr. crystals. 

 ct. cortex. 

 etc. cortical cavity. 

 ciD. cuticularised cell-wall. 

 e. epidermis, 

 ft. hypoderma. 

 ft!), hard bast. 

 k. kinoid substance. 

 ' p. pith. 



sb. soft bast. 

 sp. sieve plates. 

 St. sieve tubes. 

 vio. vessels of wood. 

 w. wood. 

 wc. wood curve. 



PLATE 1. 



Fig. 1. Epidermal cells of E. cilohutus, shortly after treatment with Schulze's solution, showing also hypoderma (h) 



(X 114). 

 Fig. la. Single epidermal cell of same, with underlying cells (x GOO). 

 Fig. 2. Cortex of E. globulus, showing a cortical cavity (x 114). 

 Fig. 2a. Cortical cells adjoining hard bast (x 114). 

 Fig. 3. Crystal in cortical cells of E.fidfolia (x 140). 



Fig. 4. Cortical parenchyma bordering on hard bast, in vertical section (x 600) 

 Fig. 5. Hard bast and adjoining tissue in vertical section (x 600). 



Fig. 6. Cambiform cells of soft bast, in vertical section— comparatively elongated and thin-walled (x 600). 

 Fig. 6a. Cambiform cells, from round to brick-shaped— the commonest form (x 600). 

 Fig. 7. Soft bast in vertical section, showing sieve-plates (sp) on radial side-walls (x 600). 

 Fig. 8. Transverse section of base of midrib of young sessile leaf, to show not only structure of midrib, as far as the 



wood-curve is concerned, but mainly for comparison with section of petiole of mature leaf. 

 Fig. 8a. Natural size of section. 



Fig. 9. Transverse section of quadrangular stem of young E. {ilohulus for comparison with that of petiole. 

 Fig. 9a. Natural size of section represented in Fig. 9. 



Fig. 10. Transverse section of stem of young E. caJopliylla for comparison with that of E. globulus. 

 Fig. 10a. Natural size of section represented in Fig. 10. 



Note.— All the preceding drawings belong to E. globulus, except Figs. 3 and 10. 



In Plates 6, Oa inclusive, the natural size of the section of each petiole is shown beside the enlarged section, and thus 

 the amount of enlargement throughout is seen at a glance. 



