86 D. Praiu — Flora of Narcondam and Barren Island. [No 2, 



to the agency of wind. As many as seventeen are unequivocally bird- 

 introdnced species ; and ten are unequivocally sea-introdnced species ; 

 the remaining three, which are all capsular-frnited HJuphorbiacece 

 (Actepliila, Macaranga and Mallotus), thongh not nneqnivocally sea-in- 

 troduced, are in all probability species of this class. 



Of the seventeen Barren Island shrubs, seven are undoubtedly bird- 

 introduced species ; nine are sea-introduced species ; one species, Dodoncea. 

 is, though somewhat equivocally, to be looked upon as wind -introduced. 



There is much greater conformity between the floras as regards this 

 class ; thirteen of the Barren Island shrubs occur also in Narcondam, 

 only four being peculiar ; all but one of the sea-shore, and all but two 

 of the bird-introduced shrubs in Bai'ren Island occur in Narcondam also. 



The trees in the two islands have last to be considered. Of the 

 thirty-three in Narcondam twenty-one, or more than three-fifths, have 

 been introduced by birds ; two from their fruits having been attached 

 to the feet or feathers, the others, by fruit-eating birds : ten may have 

 been sea-introduced ; for seven this mode of introduction is undoubted, 

 as regards Caryota it is rather equivocal, and the Coco-nut may have 

 been deliberately introduced ; two species are wind-introduced. 



Of the fifteen Barren Island trees, nine are bird-introduced species ; 

 live are sea-introduced ; one has been introduced by wind. 



Here again great conformity between the floras is observable ; of 

 the fifteen Barren Island trees, ten occur in ISTarcondam: these include 

 all the bird-introduced ones except four, and all but one of the sea-intro- 

 duced species ; one wind-introduced species is common to the two islands. 



Among herbaceous species, where the equality of numbers promised 

 most agreement, there is therefore greater diversity between the two 

 floras than among the others. 



Of the 75 species of Phanerogams peculiar to Narcondam, 22 have 

 been introduced by the sea, 42 by birds, and 10 by winds; one species 

 (Atusa) has been introduced by man. Of the 25 species peculiar to 

 Barren Island, on the other hand 5 have been introduced by the sea, 15 

 by birds, 5 by winds. Of the 40 Phanerogams common to the two 

 islands; 24 are sea-introduced, 13 are bird-introduced, 3 wind-introduced. 

 In the common element of the two floras, the sea-introduced species 

 form the dominant class, being nearly double the bird-introduced species 

 and six times as numerous as the wind-introduced ones. In the special 

 elements, on the other hand, the bird-introduced species form in both 

 instances the dominant class ; in Narcondam they are nearly twice as 

 numerous as the sea- introduced and four times as numerous as the wind- 

 introduced species ; in Barren Island, they are three times as numerous 

 as either of these kinds. 



