Fig. (35.— Section of a larcli Htem attacked \>y Armllhina nr]ha. 'J'li'! black liiir!H 

 can be RCen, especially on the right-hand side of tlie jdiotognqth ( x j i. 



Fig. 60- Hollow laich Kteni rottcl l;y I'olnponiH xulphurem (y^\\ 



