4 GOO Natuial and Artificial Selection. 

 4G50 Deg-encration. {See also L 5800.) 

 4700 Phylog-eny, {See a/so L UOO.) 



TAXONOMY. 

 5000 General. 



[Tn the ensuing numbers, 5400-7900, a slip for eacli ordinal name, and a slip 

 for each generic name, is intended to be employed, the names of both 

 orders and genera being arranged alphabetically in a single list, under each 

 class ; if the author mentions the order to which he refers a genus, then 

 in the slip on which the generic name stands alphabetically, the name of 

 the order is to be added in brackets, and under the order, in its alphabetic 

 place, a cross-reference to such genus is to be made. 



On each generic slip, if any new specific name has been introduced into 

 the genus, the symbol " n.sp." shou'.d be added after the generic name ; 

 if the genus itself is jiroposed as new, " n.gen." should be added] 



,5400 Dicotyledons. 



GOOO Monocotyledons. 



Go 00 Gymno sperms. 



GGOO Pteridosperms and Cycadofilices. 



G700 Vascular Cryptogams. 



7000 Mosses and Hepatic je. 



7300 Characeae. 



7400 Algse and Schizophycese. 



7G00 Lichens. 



7700 Fungi, Bacteria, and Mycetozoa. 



7'JOO Plants of which the position is not ascertained by 

 the Slip-maker. 



The Orders and Genera of Fossil Plants are to be arranged taxonomically 

 witli the others, a f or other distinguishing mark being prefixed. 



GEO(JRAPIIIC DISTRIBUTION. 

 8000 Distribution on Land. 



In this subdivision it is proposed to use the topo- 

 graphical system laid down in Geography. 



9000 Plankton (Pelagic Botany). 



En'ries are to bo grouped under the following areas : — 



■0-?()0 Arctic {i.e., all within the Arctic Circle). 



D300 North Atlan'.ic. 



'.1400 Tropical Atlantic. 



i)500 South Atlantic. 



ilGOO North Pacific. 



9700 Tropical I ndo- Pacific. 



DSOO South Indo-Piicific. 



9900 Autarclic, i.p., all South of L it. G0° S. 



