'] ill. I LASS] 5 01 P 



rond Thallogeue ind multitudi bich like th< 



not furnished by nature with flowers, bul whicb otherwi 

 cloBely to the higher forms of structure, occasionally acquii 

 loft) ii i Thi breathi - in their -kin ; tb 



air distinctly separated ; in Bome of them, those spiral thi 

 form bo striking ;i portion of the internal anatomy of a more pe I 

 exist in considerable abundance ; ami finally, they multiply by i 

 spheroids, or spores, either formed without the 

 contrary shall I"- proved, at all events nut possessing 

 stamens on the one hand ami embryos on the other. Their stem, how< 



not increase in diameter; it only grows at tin- end, ami hence il 



given to Buch plants the nan f A.croge> 



Tin- changes which thus occur in the races of Thalloe 

 represent the pro f development in the remainder of thi Vegi table 



Gangdom. A sphere, called a pollen grain, protrudes a tube into a soft pulpy 

 ptacle in the Ulterior of an ovule ; there the new plant take- its birth, at 



:i the form of a cell, which by d forms a thread (the sub 



then generates a cellular mass (the young embryo), ami eventually becoi 

 ells arrangi d in the form of stem ami I th( perfi cl • a: 



with its cotyledons, radicle, and plum ula). But this is not the end of growth ; 

 it i- rather the beginning. A loftier destiny awaitssuch plain- ; flowei 

 to be formed, seeds to he fertilised, and this i.- to be effected by a complex 

 apparatus unknown in A.crogens or Thallogens. 



emost among the more perfect races comes a most anomalous coll. ;c- 

 tion of species, called Rhizogens, or Rhizanths. These plants, leafless 

 and parasitical, have tho loose cellular organisation of Fungi : a spiral b! 

 tore is usually to he found among their tissue only in traces. Someofthem 



spring visibly from a shapeless cellular mass which stands in pla 1 



and root, ami seems to he altogether analogous to the thallus of Fungi : and 

 it i- probable, that they all partake in this singular mode of growth. Their 

 flowers are like those of more perfecl plants ; their Bexual apparatu 

 plete : hut their embryo, which is not furnished with any visible radicle or 

 cotyledons, appears to he a spherical or oblong homogeneous mass. Rhizi 

 Beem, in fact, of an intermediate nature between Fungal Thallogi ns and 

 Endogens. 



The remainder of the Vegetable kingdom consists of plants having flov 

 and propagated by Beeds ; that is to say, by bodies procreated by the mutual 

 action of two manifest ami undoubted Such plant- are i 



called Phsenogamous or Sexi vl. 



Sexual plants are themselves divisible into two unequal i "t 



the-.' masses one e insists of 3peciea whose germination is endorhi d, f 

 embryo has hut one cotyledon, whose leaves have parallel vein-, and v 

 trunk is formed of bundles of spiral and dotted \. • tarded bj « 



tubes; which bundles are arranged in a confused manner, and 

 in the centre of the trunk. These are E> do< eb s. 



The other mass i- composed of innumerable raci 

 germination, an embryo with two or m..re cotyledons, leaves having a net- 

 work of veins, and a trunk consisting of wood) Lund!.-- conipof 



and woody tubes, or of woody tubes alone, arranged around a central 



and either in concentric rin--. or in a li. ^ing 



medullary plaies, formii _ from the . 



* Thallogens and Aa titute the Acot 



e of Richard, thi \ ■ . • 



