OZONIUM ROOT EOT 25 



The cambium is rapidly broken down, and the stele is invaded 

 through the avenues of least resistance. 



Many such depressions are found on the roots, so that it is evident 

 why the death of an alfalfa or cotton plant under optimum condi- 

 tions for the disease is effected within a week. 



Finally the stele elements are broken down and disorganized, and 

 upon the invaded tissues the mycelium, which serves as a reserve for 

 the strand hyphse, grows profusely. 



The polymorphic nature of Ozonium, together with its unusual 

 method of entrance and its subsequent behavior within the tissues, 

 makes it an extremely interesting subject for extended investigations. 



