516 



vestigations of this character lose much of their value when they are 

 confined to the microscope and laboratory. Districts affected with the 

 dreaded pest should be visited, and the roots of the trees and their 

 branches examined, that the investigator may become acquainted with 

 all the stages of growth of the fungus, and thus ascertain how the dis- 

 ease is propagated. 



The FUNaus Erysiphe Tuckeri. — On thel5thof:May last, one of 

 the foreign grape-vines of the experimental grapery of the Department 

 was found to be affected with the fungus called Oidkim Tuclieri. It first 



