87 



stem and branch disease* Tlie only practical advice tliat can be 

 given now is that all roots severed or baiked duriiiij ground work 

 near trees should have the wonnds coated with coal tar as advised 

 for branch wounds. 



Portion of an Ehn trunk from Elvedeu Park, Suff«»lk, now in iluseum IV. 

 Kew. This is a very remarkable example of the pei-sistency of a tree 

 trving to close up a cavitv in its trunk by the continued formation of new 

 bark. It shows the necessity of assisting a tree to close up a wound by 

 providing it with a solid' surf ace on which its new bark can be laid. 



EXPLANATIOX OF PLATES. 



Plate I. 

 Fig, I,-~Sophora japonka (one of the original trees at Kcw introduced 

 17o3). The limbs are supported together by iron rods and plates as 

 described in the text. Lower down on tlie central limb i?^ a constriction 



caused by allowing an iron collar to remain too long ni one place. 



at 



Not only 



Fig. IL— Portion of the limb of a tree preserved in Museum I\. 

 K(nv. showing the result of neglecting a supporting iron collar. 

 has the collar itself become emlx^Ided, but also a link of the cnam to 



which it was attached. 



Platt IL 



Fig. III.— a neglected wound on a walnut tree. Hero is very clearly 



cutting 



the roll 



