26 



Up one of these streams no galls could be found, while along 



■ 



the other there was an abundance. It seems clear that the first 

 point attacked was upon the latter stream, and the disease has 

 spread with the water. It was found upon vines for miles below 

 the bog in question, and doubtless would ruin other bogs below 

 this one if there had been any to infest. The gall fungus is fond 

 of much moisture and probably would be checked by leaving the 

 bog dry through the winter and preventing, if possible, floods in 

 spring. The bog is now almost worthless and picking was con- 

 fined to those areas not bathed by the contaminated water. The 

 cheapest, quickest and most thorough treatment would be to burn 

 the diseased vines and start again. As several related plants 

 along the shore of the bog are also affected, it is evident that 

 these also must be destroyed. 



The so-called *' cranberry scald '* causes the loss of about 

 one-third of the cranberry crop in New Jersey, where it is now 

 mostly confined. The affected berries at first show a soft spot 

 which may spread over the whole fruit and give it a light brown 

 color. Soon after this the berry becomes wrinkled, and small 

 pustules appear, bearing spores. The diseased spot of a berry 

 when first affected is filled with the branching filaments of a fun- 



i 



gus. The whole diseased plant abounds in these threads and 

 upon the leaves at least two kinds of spores are formed, one 

 pycnidial and the other ascosporous. The fungus causing the 

 scald has not been fully determined, but it is in many respects 

 closely related to Physalospora Bidzvcllii, which causes a somewhat 

 similar decay of the grape known as the black rot. 



The thanks of the Club were extended to Prof Halsted for 

 his interesting and instructive address. 



Dr. Britton exhibited a set of thin cross sections of North 

 American woods, mounted for lantern slides, prepared by Mr. 

 Romyn B. Hough, of Lowville, New York, and remarked on the 

 beauty and value of the preparations. 



