﻿330 Halsted : Mycological Notes. 



shows two sample pods split to expose both sides, the upper in 

 each case being healthy and grown with an eastern exposure, while 

 the western halves of the same pods are shown below their respec- 

 tive mates, and were badly diseased. The ulcers were in many 

 instances of an amber color, due to the multitude of the germs of 

 the bacillus that had collected in a layer upon the surface. 



Fully nine-tenths of all the blotches were upon the western 

 sides of the pods and about two-fifths of all the pods of the variety 

 in question were badly affected. 



Strong winds upon the 1 7th and 20th of September bent the 

 plants to the southeast, from which they did not fully recover. As 

 a result, at the time the above observations were made, October 

 5th, the plants all leaned several degrees from the perpendicular 

 and some of the pods were likewise tilted. In short, the foliage of 

 the plants hung chiefly upon the eastern side of the row and had 

 done so for between two and three weeks, and therefore one side 

 of each pod was more exposed than the other, and that exposure 

 was, speaking generally, in the direction of the four o'clock sun. 



It had been previously observed that the leaves of the plants 

 under consideration were badly blighted for weeks before the pods 

 became noticeably injured, and it is not unlikely that the germs 

 were carried from the diseased leaves to the pods by the dripping 

 dews, in which case the side that was slightly inclined upward on 

 account of the slanting posture of the plants would receive a more 

 generous supply of the germs than the more protected underside. 



It is possible that the bending of the plants so exposed the pods 

 that they became more or less injured by the sun and thus pro- 

 vided more favorable conditions for the development of the bac- 

 teria. The warmth of the sunny side may have been sufficient to 

 make the difference observed. 



All the circumstances may have combined to bring about the 

 results that were so strikingly evident. The bending of the plants 

 and the swinging of the foliage to the eastward, the inclining ° f 



the pods and 



upper 



Id natu 



rally receive the drips from the diseased leaves, the autumn sun 

 during the afternoon, either adding the required warmth for the 

 germs or partially scalding the side most exposed and thus render 

 the tissues more susceptible to attack are all still open questions. 



