THE REPAIR AND REPLACING OF TREES 229 



Transplanting of this kind is usually done in late fall and 

 winter. The specimens are carried in heavy trucks especi- 

 ally constructed for the purpose of moving large trees. 



RENEWAL OF PLANTATIONS 



As the trees on a street advance in age and the failing 

 specimens become in the majority, the plantations would 

 look ragged if an attempt were made to replace only the 

 dead trees while those that were still alive, but also on the 

 verge of decay, were left standing. Then when the new 

 trees reestablished themselves, the old trees would die, and 

 under such conditions it would no longer be possible to 

 maintain a uniform planting. It is best to set out new trees 

 entirely. The soil should be renewed and as a general prac- 

 tise it is best to replant with a different species. 



Dr. W. A. Murrill writes in his bulletin on "Shade- 

 Trees," ^ "I was struck by the absence of old or even large 

 trees on the streets of Paris. All trees seem about the same 

 in age and size, and all are in the very prime of life." 



The splendid condition and the imposing effect of the 

 street-trees of Paris is due to the most painstaking methods 

 of planting and culture ; the partial replacing of failing spe- 

 cimens just so long as the uniformity of the trees can be so 

 maintained; and, finally, the renewal of the plantations en- 

 tirely when the majority of the trees begin to fail. 



The planting of small trees between old ones is a bad 

 practise, because it is hard to establish young specimens in 

 such cases. They grow slowly on account of the cutting off 

 of sunlight, they tend to shoot upward rather than to spread, 

 and the roots of the old trees invade upon the available food 



• "Shade-Trees," by W. A. Murrill, Bulletin 205, Cornell University Agri- 

 cultural Experiment Station. 



