11 



Jt'IG. 6. 



Fig. 6 shows a, perfectly healthy tree. 



PERCENT. OF INMUKY TO TKUNKS AND BLANCHES OK DISEASED TREES. 



Ill the college orchaid of some niue hundred tiees careful exami- 

 nation of all the trees was made during the past season. Of these, 

 about fifty in different parts of the orchard gave unmistakable evi- 

 dence of the '\vellows," and in every case the trunks or main branches 

 were found to be injured from 10 to GO percent. 



In no case coiild we find any indications of the disease wliere the 



