1891.] D. Prain— T^e Vegetation of the Coco Group, 3§1 



Table XVIII. Analysis of the distribution of Wind-introduced species. 



Species present in both hemispheres : — ,,,.... 21 



Cosmopolitan in the tropics (Fhanerog. 3 ; Gryptog. 12) .. 151 



Almost Cosmopolitan (Fhanerog. 1 ; Gryptog. 5) 61 



In Africa, Asia, Polynesia, America {Gryptog. ) 2 



In Africa, Asia, America (P/iawerogr.) 1 



In Asia, Australia, America [Gryptog.) 1 



In Asia, America (C?"i/pio£f.) 2 



Confined to Old World :— 43 



fin Africa, Asia, Australia, Polynesia (Cri/2'to£f.) 1 



-{ In Africa, "Asia, Australia (Gryptog.) ] 



l^In Africa, Asia (Gryptog.) ] 



fin Asia, Australia, Polynesia (Gryptog.) 3 



■^ In Asia, Australia, (Phaiierog.) 2 



(^ In Asia, Po\ynBsi&(Gryptog .) 1 



Confined to Asia, {Phanerog. 18 ; Gryptog. 16) 34 



Total of possibly wind-introduced species : — 64 



Phanerogams... 251 



Cryptogams 39| 



We thus see that 32 pei' cent, of the species are cosmopolitan, but 

 that at the same time as many as 53 per cent, are confined to South- 

 Eastern Asia, figures which tend to shew that the agency of wind appears 

 to be less active than we might expect. So far as the more local distribu- 

 tion is concerned we find that 40 species, or 62 per cent., may have 

 reached the islands either from Indo-China or from Malaya ; 10 species, or 

 15 per cent., appear to be local species ; 3 species appear to have reached 

 the islands from Malaya and one must have come either from Malaya or 

 Ceylon, these four are, however, all Gryptogams and may possibly yet be 

 found in Indo-China. Even if it be assumed that these do not occur in 

 Ba I ma, it leaves the south-west monsoon responsible for the introduction 

 of only 6f per cent, of this group of species. The remaining 10 species, 

 or about 16 per cent, of the class, have more probably been introduced 

 by the north-east monsoon, a circumstance that might be expected, 

 seeing that this monsoon blows from the direction of the nearest land. 

 And as this is the case it will follow that the probability is strong that 

 most of the species which may, so far as their present distribution 

 indicates, have come either from Indo-China or Malaya have in reality 

 come from the north-east. The only species of the kind for which this 

 is doubtful is Chonemorpha macrophylla, which, though abundant in 

 India and in the Himalaya, and equally so in Malaya and in the 

 Andamans, has not yet been recorded from any part of Indo-China to 

 the east of Khasia and Sylhet. 



The last group of introduced species — those carried by birds — has 

 now to be considered. In discussing this it its necessary to distinguish 



