OLITER ON THE STEM OF DICOTTLEDOlSrS. 309 



p. 361. Ill a stem 10 cent. diam. may be counted five zones of 

 wood separated by as many concentric rings of violet-coloured 

 liber-cells. The wood-rings are irregular in width, often sinuous 

 in outline, and traversed radially by cellular bands. A second 

 ligneous zone does not form until the stem has reached about 

 eight years of age, to which period but one ring of bark envelopes 

 its central cylinder. About this time, exterior to the first ring 

 of bber, the stem becomes laterally thickened by ligneous fascicles, 

 which extend and ultimately meet each other, forming a second 

 zone concentric to the first. After the lapse of some years a 

 third belt originates in a similar manner, and so on with the rest. 

 — Glycine caribaea and Phaseohis. Mohl, H. v. Ueber d. Bau ** 

 der Eanken- uud Schlingpflanzen. Tubingen, 1827, § 75. — Halo- 

 dendron. Link, Y. H. Icones Selectse, 1839. Fasc. i. viii. 1 — 2. 

 — Phaseolus. Kieser. Mem. sur I'orgauisation des plantes, 1814. 

 tab. 13. — Saematoxylum Cmnpeachianum. Unger, F. Ueber den 

 Grrund der Bilduug der Jahreslagen dicotyler Holzpflanzen. Bot. 

 Zeit. 1847. 268. Observation on the alternation of parenchyma- 

 tous with prosenchymatous tissue in the wood. — Phaseolus. 

 Kieser. Mem. sur I'organisation des plantes, 1814, tab. 13. — 

 Sophora japonica. De Candolle, A. Introd. a la Botanique, 

 tab. ii. 1. — Gytisus Laburnum. Hanstein, J., iiber den Zusam- 

 menhang der BlattsteUung mit dem Bau des Dicot. Holzringes. 

 Pringsheim's Jahrb. i. tab. xvii. 14-16. — JJlex,^''C. Kieser. Mem. 

 sur I'organisation des plantes, 1814, 306, tab. xxii. — JBauhinia. 

 Eichard. Nouv. Elemens de Botanique. 1846. 155. — Schleiden. 

 Principles of Botany, 254. — Graudichaud. Eecherches sur I'organo- 

 graphie, &c. des Vegetaux, tab. xviii. 1-3. — Jussieu, Ad. de. Mo- 

 nograph des Malpighiacees, p. 118. The woody axis is frequently 

 divided into fascicles by invasions of the cortical tissue ; the 

 whole usually united by a common bark. In Sclinella macros- 

 tachys the numerous fascicles are spirally wound ; some of the 

 outer bundles finally separate completely as distinct branches. 

 Vide also p. 124. — Sclinella. Martins, von. Gelehrte Anzeigen, 

 1842. 388.— Crijger, H. Bot. Zeit. 1850. 122. Detail, with 

 figures, of the structure of Bauliinia (Caulotrehis), and B,hyn- 

 chosia phaseoloides. Also 1851. p. 469 — Cassia b-angtilata, 

 and p. 471 Entada polystachya. — Mimosa (JEntadaJ. Dutrochet. 

 Mem. Auat. et Physiog. des Yegetaux, &c. 1837. tab. xiv. 3-4. — 

 3f. pudica. Schultz, C. H. Die Cyklose. Nova Acta, 1841. xviii. 

 Suppl. ii. xviii- xix. 

 EosACEAE. — Mespilus. Link, H. F. Icones Selectae. 1839. Fasc. i. 

 viii. 3-5. Structure of the spines. Also figured from liosa, 

 jRibes, Berberis, &c. — Fyrus Mnlus. Mirbel. Mem du Museum. 

 1828. xvi. 30. (fig.) — Prunus Cerasus. IMirbel. Mem. du Museum. 

 1828. xvi. 29. (fig.)— Link, H. F. Icones Anat. Bot. 1837. Fasc. 

 i. vi. 1-3. ' Icones SeleetaB,' 1839. iv. 4, 5. — Pyrits, Prunus. 

 Schacht, H. Der Baum. 195.— Mohl, H. v. Bot. Zeit. 1855. 879. 



