11 



The theory has often been advanced that the chemical constituents of 

 the same species vary in different localities, hut this idea is not verified by <mr 

 experiences as regards the Eucalypts, as they do not show those differences in 

 chemical constituents that might perhaps be expected from differences of soils or 

 localities. The reverse may possibly be accounted for by the natural selective, 

 ecological peculiarities shown in many instances by the species themselves, as it is 

 remarkable how a certain species will nourish on a particular geological 

 formation and become singular to like formations, while at the same time 

 objecting to those entirely different. However that may be, those influences 

 do not appear to act detrimentally, or to interfere in any way with the practical 

 constancy of results. 



