4600 Natural and Artificial i:-elect_ioii. 

 4650 Degeneration. (See also L 5800.) 

 4700 Phylogeny. {See also L 4400.) 



TAXONOMY. 



5000 General. 



[In tlie ensuing numbers, 5400-7900, a slip for eacli ordinal name.ana a slip 

 for each generic name, is intended to be employed,_the names ot both 

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

 class; if the author mentions the order to which he reters a genu-, then 

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

 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." should be added after the generic nmie ; 

 if the genus itscif i* ].roposed as nc\v, " n.gen. should be added. - 



5400 Dicotyledons. 



6000 Monocotyledons. 



6500 Gymnosperms. 



6700 Vascular Cryptogams. 



7000 Mosses and Hepaticae. 



7300 Characese. 



7400 Algse and Schizophycese. 



7600 Lichens. 



7700 Fungi, Bacteria, and Mycetozoa. 



7900 Plants of which the position is not ascertained by 

 the Slip-maker. 



The Orders and aonera of Fossil Plants are to be arranged taxonomiiMlly 

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



aEOGRAPHIC DISTRIBUTION. 

 8000 Distribution on Land. 



In this subdivi-^ioii it is proposed to use the toi)o- 

 graphical system laid down in Geography. 



9000 Plankton (Pelagic Botany). 



Entries are to be g-rouped under the following- areas :— 



9200 Arctic O'.e., all within the Arctic Circle). 



9300 North Atlantic. 



9400 Tropical Atlantic. 



9500 South Atlantic. 



9600 North Pacific. 



9700 Tropical Indo-Pacific. 



i)800 Soutli Indo-Pacific. 



9900 Antarctic, i.e., all Soutli of Lat. 60° S. 



