12 



braiiclies or trunk were not iiijuied in some way. Figs. 1, 2 and 3 

 illustrate some of the injuries. 



CONCLUSION. 



While we do not know the exact nature of the disease called the 

 " yellows " and cannot wholly control the atmospheric causes, the 

 other causes we can largely control and by careful cultivation in the 

 spring and early summer only, by the use of complete fertilizers in 

 the fall or early in the spring we can largely prevent this destructive 

 disease. It may not be profitable to try to save diseased trees, and 

 it w^ould be advisable to destroy them as a matter of safety, although 

 we have no evidence that the disease is contagious ; for upon the 

 college grounds more or less diseased trees may be found at all times 

 and young trees are planted where old trees have died and with an 

 abundance of plant food have grown in perfect health for six years. 



