942 Lee. — Anatomy and Morphology of P achy podium. 
Fig. 8 . Diagram of part of young spine in transverse section. E = epidermis ; w = water-storing 
layer ; L = lignified tissue ; P = parenchyma ; c = central tissue. 
Fig. 9. Central tissue of young spine in transverse section, x 220. 
Fig. 10. Transverse section of portion of water-storing tissue of young spine, showing origin of 
phellogen (/%.). w = water-storing tissue; E = epidermis, x 220. 
Fig. 11. Part of central tissue of mature spine, showing space ( sp .) left by disappearance of 
phloem. 
Fig. 12. Surface view of stoma. 
Fig. 13. Lamina of leaf in transverse section. e x = upper epidermis ; e 2 = lower epidermis. 
