APPENDIX 



569 



found described in Note 22. Those tested were Cassytha filiformis, 

 Cerbera Odollam, Ipomea pes caprai, Morinda citrifolia, Premna tahitensis, 

 Scaevola Kcenigii, and Tacca pinnatifida. In all but Cerbera Odollam, 

 where I contented myself with establishing that the fruits floated buoy- 

 andy in sea-water, the experiments were prolonged for many weeks and 

 often for several months ; and in some cases, as with Ipomea pes capr^e, three 

 or four experiments were made on seeds from different inland localities. 

 The result was to establish in all cases that the floating powers were as 

 great with the inland as with the coast plants of the same species ; nor 

 could any structural difference of importance be noticed. It should be 

 observed that there is every reason to believe that the " talasinga " plains 

 of Fiji have been occupied by the intruding beach-plants for many ages. 



NOTE 45 (page 122) 



Tabulated Results of the Classification, accordinc; to Schimper's 

 Application of the Natural Selection Theory, of the Buoyant 

 Seeds and Fruits of the Tropical Littoral Plants on the 

 Basis of the Structural Characters concerned in Buoyancy 



Note. — If to the last we add the eight British shore plants, the buoyant fruits of which are described 

 in Chapter XII., three non-adaptive and five adaptive, we get a proportion of adaptive species for tem- 

 perate and tropical regions of fifty-one per cent. This is probably fairly typical of the world generally ; 

 but it must be remembered by the reader that the author regards them all as non-adaptive. In that case, 

 the table can be used for the numerical results of the three groups which are based only on structur.-il 

 characters without reference to any theory. 



NOTE 46 (page 1 24) 



On the Modes of Dispersal of the Genus Brackenridgea. 



Seed-vessels of this genus found afloat in the New Guinea drift are de- 

 scribed by Mr. Hemsley as having two curved cavities crossing each other, 

 one containing a seed, the other empty. " This empty cavity," it is stated, 

 "gives the fruit its buoyancy" {Bo^. Chall. Exped., iii., 289 ; plate 54). 

 Dr. Beccari, in the English edition of his IVavderings in Borneo, p. 187, 



