Gummosis of Prunus ¢ Citrus 
@ 
THESIS 
‘ PeB 
PRESENTED TO THE FACULTY GRADUATE 
“SCHOOL OF CORNELL UNIVERSITY 
FOR THE 
DEGREE OF DOCTOR OF PHILOSOPHY 
! 
BY 
‘' 
ORMOND BUTLER 
WITH PLATES VII-X 
| [Reprinted . from ‘Annals of Botany, Vol. XXV, No. XCVIT] 
