1 ! 



fhe theory has often been advanced that the chemical constituents ol 

 the same species vary in differenl localities, but this idea, is no1 verified by our 

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

 chemical constituents that might perhaps bo exported 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 flourish on a particular geological 

 formation and become singular to like formations, while a! 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. 



