52 



ADHESION. 



were tlnis transposed, wliile the ii})per portions or 

 crowns were unaffected : the root of one, naturally 



Fig. 22. Adhesion of the branches of two elms. ' Gard. Chron.,' 

 1849, p. 421. 



weak, became distended and enlarged by the abundant 

 matter poured into it by its new crown ; and in like 

 manner the root of the other, naturally vigorous, was 

 starved by insufficient food derived from the new crown, 

 and became diminutive and shrunken (see Synophty) . 



The explanation of the fact that the stumps of felled 

 fir trees occasionally continue to grow, and to deposit 

 fresh zones of wood over the stump, depends on similar 

 facts. In Ahles pedlnnta^ says Goeppert,^ the roots 

 of different individuals frequently unite ; hence if one 

 be cut down, its stump may continue to live, being 

 supplied with nourishment from the adjacent trees to 

 which it is adherent by means of its roots. 



' ' Ann. Sc. Nat.,' t. xix, 1843. p. 141. tah. iv. 



