S. 0. Paine and H. Stansfield 



29 



In the cell marked A the gummy mass was densely stained and appeared 

 very definitely granular, the substance surrounding the granular mass 

 possessed a fine foam-structure. In cell B granules of about the size of 

 small bacteria could be distinctly recognised; here also the matrix 

 showed a foam-structure, but of a coarser character than in cell A. 

 In cell C masses of densely staining material were surrounded bv a mass 



50/u 





Fig. 3. Drawn with the aid of the camera lucida from a microtome section 4/x in thickness 

 through a leaf spot of Proten cynaroides; note the very frangible nature of the gum- 

 Uke substance filling the majority of the cells. A, cell filled with granules believed to 

 be bacteria, the cause of the disease; B, cell filled with gum in which are embedded 

 similar granules which appear to be in process of dissolution. 



of gum which had become very vacuolate and which took up the fuchsin 

 stain only weakly. Cell Z) was almost completely filled with similar 

 vacuolate material. The cells which are shaded uniformly in Figs. 4 and 5 

 were filled entirely with structureless transparent gum-like material 

 which showed different degrees of staining capacity in the different cells, 

 as is shown, for instance, in the cells marked A and B, Fig. 4. The 

 substance in cell A was entirely unstained by fuchsin and possessed a 



