326 BROOKLYN BOTANIC GARDEN MEMOIRS 



8. The material constituents of each plant organism — in them- 

 selves inert — constitute the gauge or measure by which tubes of in- 

 flowing or stimulant energy, and outflowing or reaction energy can 

 best be estimated. The structure of all plant organisms, therefore, 

 is a cumulated expression of the continued flow of definite tubes of 

 energy, and the resultant placing, in definite and orderly manner, of 

 otherwise inert material particles, when moved by such streams of 

 energy. 



