THE LEAF. 73 



quently so profound that it becomes a matter of no little 

 difficulty to pronounce upon the morphological Modified 

 character of a particular structure. Spines leaves - 

 and tendrils, for example, may represent either leaves or 

 branches. The morphological character of bud-scales, on 

 the other hand, is usually recognized at once from their 

 position, structure, and especially from the various transi- 

 tional forms by which they are connected with ordinary 

 leaves. Though often puzzling, the morphology of modi- 

 fled leaves is always an exceedingly interesting and profit- 

 able study. 1 



1 Cf. Gray, Structural Botany, pp. 110-118. 



