PERMEABILITY AND CLASSIFICATION 93 



siderable variation between different samples, one sample having 

 a low percentage and another a high percentage of permeable 

 seeds. This was well brought out in Dr Gola's observations, 

 already dealt with in Chapter III. 



One may add with reference to the short list added to my 

 tables containing seeds also experimented upon by Professor 

 Ewart that the only discrepancy is concerned with those of 

 Leuctenag/auca,vfhich,according to my observations, are regarded 

 as impermeable instead of permeable, as is indicated in the 

 Australian experiments. 



THE GROUPING OF THE SEEDS EMPLOYED IN 

 THIS INQUIRY ACCORDING TO THEIR PER- 

 MEABLE OR IMPERMEABLE QUALITIES 



I. IMPERMEABLE 



Adenanthera pavonina Leguminosae (S) 



Colubrina asiatica Rhamneae (F) 



Dioclea reflexa Leguminosae (F) 



Entada scandens (F) 



Guilandina bonduc (S) 



bonducella (F) 



(near) glabra (F) 



melanosperma (S) 



Ipomoea dissecta Convolvulaceae (S) 



pes-caprae (F) 



tuba (F) 



Leucaena glauca Leguminosae (S) 



Mucuna urens (F) 



Sophora tomentosa (F) 



Strongylodon lucidum (F) 



Ulex europaeus (S) 



Vigna luteola (F) 



Note. The capital letters in brackets have the following significations relating to 

 buoyancy in sea-water : 



F = Known to be dispersed by sea- currents, the proportion of buoyant seeds varying 

 from as much as 80 or 90 per cent, in Guilandina bonducella to as little 

 as to per cent, in Dioclea reflexa. However, seeds vary much in this 

 respect in different localities. From my observation of the living plant 

 in Fiji and Ecuador I formed the conclusion that quite half of the seeds 

 of Entada scandens have no initial buoyancy ; whereas of fresh seeds 

 obtained from the plants growing in the Jamaica woods I found that quite 

 90 per cent, floated (vide the author's Plant Dispersal, p. 181). 

 S = All sink. 



