Report OF THE BOTANIST. 59 
EXPLANATION OF PLATES IT AND III. 
Puate I1.—Apple and quince leaves affected with frost blister. 
(Nat. Size.) 
lig. 1.—Apple leaf, upper surface. 
Vic. 2.—Apple leaf, lower surface, showing dead, brown 
spots where frost blisters have broken. 
Fig. 3.—Quince leaf, upper surface. 
Fie. 4.—Same quince leaf, lower surface. 
Prats IlI.—Structure of frost blisters on apple leaves. 
Fic. 1—Cross sections of blistered apple leaves. (Natural 
size. Diagrammatic. Original.) 
Fic. 2.—Cross_ section of blistered apple leaf. (After 
Sorauer. ) 
