OLITEE ON THE STEM OF 1IIC0TTLED0>'S. 323 



pith of B. repanda. Introd. Botany, i. 192, also in Penny Cy- 

 clop. X. Exogens. — Mirahilis. Bernliardi. Ueber Pfl. Grefasse,lS05, 

 12, 20, tab. 1. fig. 1. — BischofF, Lehrbuch, ii. Q^.—Fisonia, S(c. 

 Sclileiden, "Wiegmann's Arcbiv. 1839, 223. — Lindlev, J. Introd. 

 Botany, i. 215. witb fig.-Criiger, H. Bot. Zeit. 1850. p. 164 

 Observations on Structure of Fisonia. — Eegnault, Ann. So. Xat. 

 Ser. iv. xiv. 144. Pisoniafragrans. Witbiu the double, cellular, 

 cortical layer, is a fibrous circle, often interrupted, however, and 

 eometimes concealed by the crystalline concretions which abound 

 in this part. The wood is divided by a few medullary rays, each 

 consisting of a single row of cells "with dotted walls. The wood 

 prosenchyma is thick- walled and finely dotted ; its mass present- 

 ing, in cross- section, a series of rounded spaces, elongated parallel 

 to the circumference, and disposed so as to form interrupted con- 

 centric circles around the pith. In each of these islets in the 

 wood are found two layers — the outer (towards the bark) of 

 tolerably large and rather long cells ; the inner, elongated, fibroid, 

 and closely packed — together recalling the arrangement of tissue 

 in the generative zone. The vessels are always disposed on the 

 inner face of these islets, where they form irregular, radiating trains, 

 plunged in the wood-prosenchyma. Isolated fibro-vascular bundles, 

 corresponding to those found scattered through the wood, aro 

 found in the pith. Their structure is described in detail. Oxy- 

 haphus viscosus and Mirabilis present essentially the same struc- 

 tiu'e ; the liber-fibres, however, seem absent in the former. 

 CHEyoPODiACEAE. — Chenopodium. Link, H. F. Ann. du Museum, 

 1812, xix. 339. Note on.— Elementa, Phil. Bot. 1837, i. 245.— 

 Bischoff, Lehrbuch, ii. 57. — Unger, Fr. Ueber d. Ban, &c. de^ 

 Dicotyledonen-Stammes. St. Petersburg, 1840, with plates. — Link, 

 Jahresb. 1840. Absch. atI. Structure and growth of Chenopodia- 

 eeae (and Amaranthaceae). As in Nyctajineae, there occurs a 

 double vascular system. An interior in the pith and immediately 

 around it, continuous through the entire stem, and supplying the 

 appendicular organs with vessels : and an exterior system, essen- 

 tially distinct from the former in its composition, likewise con- 

 tinuous through and proper to the stem, especially forming the 

 wood-mass. — Beta. G-audichaud, Eecherchessurrorganograpliie, 

 &c. des Yegetaux, tab. xii. 1-4 — Schacht, H. PflanzeuzeDe, 2^3, 

 t. XT. — Brongniart, A. and others. Eej)ort on Mem. of M. De- 

 caisne ' Eecherches sur I'organisation anatomique de la Betterave,' 

 Ann. Sc. Nat. Ser. ii. 11, 49. — Liudley, J. \e^. Kingdom, 512-3. 

 Schacht, H. Pflanzenzelle, 283. — Anohasis {Haloxi/lon), Ammoden- 

 dron. M. Basiner, iiber. — in ' Eeise durch die Kirgisensteppe,' 

 in Baer und Helmersen's Beitrage, z. Eenntniss d. Euss. Eeiches. 

 XV. 93. — C. A. V. Grernet. Notizen iiber den Bau des Holzkor- 

 pers einiger Chenopodiaceen. Moscow Bull. Soc. Imp. Nat. 

 1859, 164, with 1 plate. — Chenopodium album and Sahola Kali 

 agree in the absence of liber and of medullary rays, in the presence 



