14 



COHESION. 



the former it may be said that the whole of the stem 

 is more or less affected, in the latter it is rare to see 

 more than one or two branches of the same tree thus 

 defoi-raed. It is a common thing for the fasciated 

 branch to divide at the summit into a number of sub- 

 di\4sions. These latter may be deformed like the parent 

 branch, or they may resume the ordinary aspect of the 

 twigs. 



Sometimes the flattened stem is destitute of buds, 

 at other times, these organs are scattered irregularly 

 over its surface or are crowded together in a sort of 



Fio. 6. Fasciation and spiral torsion in the stem of Aparagiis. 



