Bui. 213, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate XXX. 



Radial section through a daisy petiole showing the internal origin of a small metastatic tumor. 

 The normal tissues are bracl<eted, the epidermis is not yet ruptured, and the tumor includes 

 all kinds of tissues peculiar to the petiole. 



