Street and Shade Trees. 41 



trees by horses and by careless usage of workmen about them is 

 incalculable. Prosecution is useless, because an adequate penalty 

 that would deter others is never imposed. 



It is needless to speak to experienced fruit-growers of the best pre- 

 ventives or remedies for insect pests of any kind, or for any of the 

 various kinds of fungus. That work is as familiar to you as the 

 alphabet. But systematic and effective treatment of street trees for 

 any plague that may attack them is exceedingly rare and difficult. 

 Some caterpillars are easily conquered if the eggs or the chrysalis be 

 attacked in time, but this is usually prevented by stoical indifference 

 at this dormant stage. Disease caused by smoke and dust is incur- 

 able. No species of tree is proof against these if their presence be 

 nearly constant in large quantities. Finally, the gist of the whole 

 matter may be summed up in the obtrusive form of sententious 

 advice. Select the kinds of trees that experience commends to you 

 as most likely to satisfy your own taste, and to suit the conditions of 

 soil and situation in your street. Select young trees only, of thrifty 

 habit and good form. Furnish good soil in ample quantity at what- 

 ever cost or trouble. Give ample room for full growth on every side. 

 Handle and transplant with proper care and skill. Mulch and water 

 effectively until the trees be fully established. Guard from damage 

 by any device that will serve your purpose. Fight to the death every 

 pest and plague as soon as it appears. Give constant watchfulness 

 to the tree's welfare while you hve, and impose the same duty by 

 your last testament upon the successors to your trust when you die. 

 " Eternal vigilance is the price" of every street tree. 



