134 PRINCIPLES OF GARDENING. [CH. III. 



part of the summer, are employed in preparing 

 nourishment for the production of the foliage and 

 blossom in the succeeding spring ; this nourishment 

 is perfected and deposited in the alburnum, and 

 mixes with the saj) dming its ascent in that season. 

 Of a consequence it is found to increase in density- 

 proportionate to the height at which it is extracted. 



I 



