128 



Especially such plants were numerous as are able to rapidly 

 multiply vegetatively and can do without animals for the pol- 

 lination of their flowers and the dispersal of their seeds or 

 fruits. 



4. It is fully unknown whether between 1886 and 1897 plants have 



been introduced and, if so, in which manner. 



5. Nothing is known of the fauna of 1897 and its relations to the 



vegetation. 



6. in 1897 no examination has been instituted after the degree of 



weathering and the humidity of the soil. But from the fact 

 that Saccharum occurred gregariously on ash- and pumice-fields 

 may be safely deduced that these localities were neither 

 lacking in fertility nor in humidity and were by no means 

 unfit for the development of forest. 



7. Hence the lack of forest in the examined parts cannot be 



ascribed to edaphic or climatic conditions but must have 

 another cause, probably a quite unsufficient import of seeds 

 from other localities either on the mountain or outside it. 



8. Nothing was in 1897 brought to light about the composition 



and origin of the vegetation of localities which were most 

 important for the investigation, viz. the higher ravines. 



