CONTENTS. 



Page. 



Occurrence of tumors 5 



Description 6 



Experiments 9 



Structure of tumors 10 



Relation of tiie tumors to other forms of disease 11 



Effect of the disease upon trees 12 



Suggestions to nurserymen, nursery inspectors, and orchardists 15 



Reports desired on the distribution and severity of stem tumors or knots 16 



[Cir. 3] 



3 



