80 



DEVELOPMENT OF FOKM 



[CH. 



by strengthening and elongating the stem and principal 

 branches, and throwing the energy of growth (so to speak) 

 somewhat more into the outside secondary and tertiary 

 laterals than into those directed inwards. This is a very 

 common occurrence in such trees, and may be seen in 

 medium sized specimens of Horse-chestnut, Ash, and 

 others in many a winter landscape. 



It is the continuance of this preponderance of growth 

 of the outer laterals which leads to forms like Fig. 28, 

 where further asymmetry is introduced by the inevitable 

 irregularity of growth among the competing branches, for 

 it will be noted that Fig. 28 has been developed from 

 Fig. 27 by means exactly similar to those before employed. 



