302 OEIGINAL ARTICLES, 



Nymphjeace^. De Canclolle, A. P. • Sur les Nympliaeacces. Soc- 

 Phys. de Greneve, i. 2. — Treeul, A. Etudes aBatomiques et orga- 

 nogeniques sur la Victoria regia, et anatomie compares du Nelum- 

 lium du Nwpliar et de la Victoria. Ann. Sc. Nat. Ser. iv. 1. 

 145,— J. D. Hooker and T. Thomson. " Flora Indica," i. 236. 

 The central medullary mass is surrounded by a tolerably well- 

 defined zone of vascular bundles. Liber, wood-wedges and 

 medidlary rays are absent, and the vascular tissue confused, 

 possibly from the crowded state of the internodes. Victoria, 

 in the absence of a pith-like centre is regarded as excep- 

 tional.— Caspary, E. Sur la Structure de la tige. (Bot. Zeit, 

 1857.) Bull. Soc. Bot. iv. 718. — Einige wenige Bemerkungen 

 iiber den Bau des Stammes der Nymphfeaeeae. Plora, 

 1857, 717, also in Bot. Zeit. 1857, 791. The vessels are 

 scattered in the central vascular system of the stem, not 

 arranged in a circle : in the outer portion of the central sys- 

 tem they anastomose in short, dense bundles, allowing cords 

 to pass to the leaves, peduncles, roots, &c., through regular 

 openings. — Bonn, Sitzungsbericht. 1858, xv. and Flora 1859, 

 118. On the formation of cork-cells and absorption of spiral 

 vessels in Nymphaca gigantea. — Nwpliar lutea. Treeul, A. E«- 

 cherches sur la Structure et le developpement du Nuphar lutea. 

 Ann. Sc. Nat. Ser. iii. 4, 286. The structure of the rhizome, of 

 which a detailed account is given, is stated to be quite similar to 

 that of Monocotyledons. There are no distinct concentric layers 

 nor medullary rays, the fibrous fascicles being separated by inter- 

 posed pith-parenchyma. Its density decreases from the^ cir- 

 cimiference to the centre. — Vaupell, C. ilber d. peripherische 

 "Wachsthum d. Gefassbiindel, &c. Leipsic, 1855, p. 23. — Victoria. 

 Henfrey, A. On the Structure of the Stem of V. regia. Phil. 

 Trans. 1852, 289, with 2 Plates. A. N. Hist. Ser. ii. 10, 398. 

 The internal structure is quite monocotyledonous in character. 

 No true woody fibres, no cambium layer, no arrangement of the 

 vascular bundles in zones. The vascvdar fascicles, composed of 

 spiral vessels, and annular and reticulated ducts, are isolated in 

 the parenchyma of the stem. 

 Nelumbiace^. Mii-bel. Observations Anat. et Physiol, sur le 

 Nelumbo. Aim. d. Museum. 1809, xiii. 465. — Endlicher imd 

 Unger. Grundziige d. Botanik, 92. — Treeul, A. Ann. Sc. Nat. 

 Ser. iv. 1, 145. Differs from Nymphseacese in the anatomical 

 character of the rhizome. 

 Papayeraceae. — Chelidoninm. Moldenhauer. Beitrage z. Ana- 

 tomie d. Pflanzen, 1812, 141. — Amici, J. B. Observations Mi- 

 croscopiques, Ann. Sc. Nat, 1824, vol. i. 224, tab. 13.— Link, H. F. 

 Icones Anat. Bot. 1837, Fasc. ii. xiv. 8. - Schultz, C. H. Die 

 Gyklose,* Nova Acta, 1841, xviii. Suppl. ii. tab. xvi. — Bocconia. 



* Sections of othei' herbaceous plants are figured in this essay, viz. Tropceolum, 

 Coehlcaria, Brassica, Impatiens, Plantago, Valeriana, Portulaca, Erodium, Occalis. 



