42 



when grubbed, show any symptom of a 

 tap root more than other trees. 



The celebrated Duhamel, wishhig to 

 protect his field from robber}^ from the 

 roots of a row of elms, cut a deep ditcli 

 between the elms and his field. The roots, 

 . however, were not to be done. They of 

 course followed the surface of the ground, 

 whether down, horizontal, or up hill, and 

 took the ditch " in and out clever " into 

 the philosopher's field. Duhamel thinks 

 these were very cunning roots, and that 

 they had an instinctive notion of the treat 

 they were to have on the other side of 

 the ditch, and grew at it. . Had the philo- 

 sopher built a wall in the ditch, and then 

 filled it in, he would have beaten the roots, 

 on account of their inability to leave the 

 surface and get under the wall. 



Were we to add one step to the beau- 

 tiful theories of Knight and Dutrochet 

 respecting the growth of adhesive plants, 



