ENDOi 



slit o] ide, in the cavity of which the plumule pep 



embryo ie a flal plate as in . with the plumule and 



to it' face near the base. In the latter case the flat ; 



cotyledon, which, in the Becond instance, is folded togethei 



the embryo the appearance of being -lit, and which in t ; 



habitual, condition is not only folded up, but united at 



entirely burying the plumule and cotyledon. Hence the embi 



endo Killed monocotyledonous; a name thai is really unexceptioi 



notwithstanding th tcasional appearance of a i rudimentan 



don, as occurs in common wheat. M. Adrien de Jussieu baa i 



ow thai th.- slit, which is generally Bupposed to 1"- peculiar to the 

 Arums and their allies, is of general occurrence in the end 

 (.1 Sc.N.& i. p. 341.) 



It baa already been stated that the radicle is protruded in germinal 

 from within the Bub of the embryo; the base of the radicli 



Bequently Burrounded bj a minute collar formed of the edges of the ap rture 

 produced by the radicle upon it- egress. For this reason I 

 endorhizaL 



al natural class of plant- forming the Bubject of t! 

 remarks has five most important physiological peculiarities, by all which 

 combined, or usually by each of which separately, the class maj 

 chai ed. 



1 . The wood is endogenous. 



2. The leaves arc Btraight-veined. 



3. The organs of fructification are ternary. 



4. The embryo is monocotyledonous. 



5. The germination is endorhizal. 



It may however be readily supposed that, viewed as a hit _ 

 plants, Emlogfiis an .ally char.. only by the combinatii 



these five peculiarities, and that occasional deviations may occur froi 

 one ol them. Tim- in Naias, Caulinia, ZannicheUia, and others, which • 

 Btitute a part of what Professor Schultz mum- Homorganous floriferous 

 plants, the whole organisation of the stem is bo imperfect that the endo- 

 genous character is lost : but their true nature is nevertheless sufficiently 

 indicated by their straight vein-, monocotyledonous embryo, & 



examples of a concentricaJ arrangement of the w lv bundles, 



alluded to, may be regarded as insl I endogenous I I 



big towards the exogenous, and are usually looked upon as 

 tion from one form to the ether —perhaps not very correctly. I 

 nature are the resemblances between the columnar Cycadac< 

 sperms and Palms, between the livid, Foetid, one-sided calj i 

 ami the equally livid, foetid, one-sided Bpathe of Araceous E 



another poihl of view, between BUch lenticular plant- a- 1. 



with the leave- ami Btems fused, a- it were, together, and sii 

 stem and leaf among Kfarchantiaceous \ -i-. 



Really intermediate forms of vegetation connecting End< 

 classes, arc extremely uncommon. One of the 

 occur- between Ranunculacese ami Nymph 

 and Alismacese and Hydrocharacese en thai 

 lingua, or better R. parnassifolius, is contra ted with 

 Damasonium, leaving out of consideration subordinat 1 U> 



found that there i- little of a positive natun ' I 



albuminous dicotyledonous seeds of the former 



