XVII C^SALPINIA 197 



(lo) The buoyancy of the seed is developed during the final 

 shrinking process associated with its maturation, a large cavity 

 between the cotyledons being usually produced. 



Note. — Since most of the principal conclusions of this work are 

 involved in my especial study of the littoral species of Afzelia, 

 Caesalpinia, and Entada, the reader is advised, if he wishes to form 

 an opinion of the author's method of investigation, to read this 

 chapter carefully through. With most other shore-plants, though 

 in not a few cases studied with the same detail, the exigencies of 

 space have often limited me to the employment of the general 

 results in the appropriate chapters without entering into details. 

 Should he desire to test any view of his own relating to plant- 

 dispersal, he could not do better than begin with the materials here 

 provided. 



