OF SOME SAPOTACEOUS SEEDLINGS. 199 
BIBLIOGRAPHY. 
R. Gérarp.—“ Recherches sur le passage de la racine à la tige." Ann. des Sci. Nat. Bot. ième série, 
tom. xi. 1881, p. 279. 
P. Dancearv.— Recherches sur le mode d'union de la tige et de la racine.” Le Botaniste, 1è"? série, 
1889, p. 75. 
E. Sarcanr.—“ A new Type of Transition from Stem to Root in the Vascular System of Seedlings.” 
Aun. Bot. vol. xiv. no. lvi. (Dec. 1900). 
E. Sarcant.— Origin of the Seed Leaf in Monocotyledons." New Phytologist, vol. i. no. 5 (1902). 
E. N. Taomas.—“ A Theory of the Double Leaf-trace founded on Seedling Structure.” New 
Phytologist, vol. vi. p. 77 (1907). 
H. Wricnr.—* The Genus Diospyros in Ceylon.” Ann. R. Bot. Gar. Peradeniya, vol. ii. pt. 1 (1 904). 
H. Marre.—‘Sur la développement morphologique et anatomique de germinations des Cycadées." 
Caen, 1908. 
EXPLANATION OF PLATES 25 & 26. 
Abbreviations and symbols :— 
Black or pz. indicates protoxylem. 
Circles or mz. » metaxylem. 
Hatching or /ig.par. »  lignified parenchyma. 
chm. » cambium. 
t. » testa. 
cot. » cotyledon. 
pet. » . petiole. 
Dots or ph. » phloem with latex, &c. 
Radial lines or z.* » secondary xylem. 
White or par. »  ground-tissue. 
end. »  endodermis. 
al. » endosperm. 
h »  latex-cell. 
Payena Leerii. Figs. 1-10. 
Fig. 1. Seedling of Payena Leerii with thickened zone shaded. Horizontal lines mark the position of 
sections illustrated. x1. 
Figs. 2-8, Diagrams of a series of transverse sections of the stele of fig. 1, to show transition from root 
j to stem. All are on the same scale. The vertical line indicates the cotyledonary plane. 
Fig. 2. Transverse section of the root-stele 82:1 mm. below the node. i 
3. Transverse section of the root-stele 81:4 mm. below the node, to show the increase in number of 
metaxylem elements. 
