JlKSIKl'.] 



NAT1 KAI. SYST1 \l- 





too 



71. Mi 



■ 



• . 117 



i 

 -a. cutl, i . 

 81. Itul 



\iv. 

 84. Biu 



i 



•:i. M.Wtl. 



B3. It.. 







i 



i 

 I 

 ■ 





1810. liu.m n. Robert 



[d this work the sysl f Jussieu is principal!} followed, but 1 i I 



and the sequence <>l the Orders is changed. The author Btutes that he n 



the Orders of Jussieu as being truly natural, but h ididly 



admits, often artificial, and apparently founded upon doubtful principles. Ii wa 



.in of Dr. Brown i" publish a second volume "t his work, and then t" explain 

 . u- upon this and other Bubjects ; but that intention lias not yel be< n carried into 



execution. It i- here that we find die important f the icstivation of the dower 



pointed out, and applied to the characters ol Natural Ordei i so characters have 

 a model for succei ding n rit< re. 



D I - , A. P. (Tktori / 



r . Ut I 



In this work is i" be found the explanation of the principles which guided its clear- 

 minded author t" the construction of a inrili.nl of arrangement which has now almost 

 superseded all others, partly because of its easiness and simplicity, and m cially 



-■■ ii is that which has been followed in the author's Pr ated 



iption of species. He himself explains thi he has taken, to the following 



• Bed : •• I place Dicotyledons first, because they have the greatest numbers of distinct 

 jans Then, as 1 find families where some of thi se organs become con- 

 solidated, and consequently Beem tn disappear, I refer them to a lower rank, 

 principle gives me the following series: — 



1. Dii . ].. lypetalous a 



-. ; and pi 



S. ; monopetalous and i 



■J. ; and liypogynous. 



5. ; apetalous, nr with a Ianth. 



Ii U ...lis. 



7. : . 



; leafy and Bexual. 

 0. ; leafless and without any knowi 



I have adopted this series partly because 1 think it that which is least removed from :i 



natural sequence, and partly because it is i venient and easj for study. But let no 



one imagine that I attach the least importance to it. The true - 

 Natural History consists in the Btudy of the symmetry peculiar to each family, and of the 

 relation which these families bear to each other. All the rest is mererj 'ding, 



better or worse Buited to accomplish that end." p. 206, 



A.t this time De Candolle made no attempt to combine tlie Natural Orders in Alli- 



anci - ; but :u a later pi riod in a - nd edition of the . 



few such groups, under the name oi Cohorts, as will be seen by the following list 

 Ord< re, taken from the edition of 1819. In that of 1844, published h\ h - 



ill se Cohorts are all broken up, and considerable alteratioi ■ 

 sequence of the Natural Orders. I. however, prefer publishing his plan o Mli- 



ances, rather than his la-t list, even although that does give his ; 



otvi «• 



. that 



ly, furnished with 



.' ,1 ves- 



ma 



I. i'\ , as or Dicotyle- 

 iii.it is to say, 

 where the vessels are 

 arrai ged in concentric 

 layers, of which the 

 outer- 

 most, nn.l where the 

 embryo t.as opp< 

 verUcillate cotyledons. 



.nth doubli 

 is. where the calj \ and 

 act. 



7. Pi dophi 



8. N'yni] ! .. 



Is 1 . 



'I'll VI VMM : 



distinct, Ii 



<mi tin- i. . 



i i on- ,j 



nitrons, or stamens op- .', 

 posite the petals. 



12. I 

 1. Ranunculao as, IS i 

 8. Dflleniaceae, 123 

 3. Magnol . -117 



t Inonai b, ISO 



i, M ins; ! nn... 



1 ' 1 



I 

 0. Paj 



13. 1 



1 i. 1 



\ 



16. P 



17. R 





