No. 10. Bark shcwinu- piistules of a dark color or of a l)rownisli tint, due to longer 

 exposure to weallier. — Photdfiniph hi/ Prof. CoJliiift. 



No. V2. Diseased c-lies*nut tree s-l-owiu^- slnvdded hark after two or three years in- 

 fection. — I'h<jto(jrai)h hy Prof. Collins. 



