April, '14] FELT: REACTION OF SUGAR MAPLES 173 



standpoint the effect is weaker day by day. In the cases mentioned 

 the lime-suphur wash was effective within a week after its appUcation. 



President P. J. Parrott: We have conducted some comparative 

 experiments in New York with the polysulphides of barium, calcium, 

 sodium and potassium. The percentage of scales killed by the differ- 

 ent compounds ranged from about 94 to 100 per cent. The calcium 

 and barium preparations were uniformly more effective than the other 

 mixtures. With all of the polysulphides there was some breeding, 

 which was more noticeable on the trees sprayed with the sodium and 

 potassium mixtures. This difference in effectiveness we attributed to 

 the greater solubilities of the latter compounds. 



Question: What results did you have with the polysulphide of 

 calcium? 



President P. J. Parrott: The barium polysulphide was the most 

 efficient preparation, while calcium polysulphide ranked as a close 

 second in effectiveness. 



A member: I have noticed that we cannot get good results with 

 lime-sulphur wash after the 1st of April, that is, after the trees begin 

 to grow actively. For some unknown reason the scales are not killed 

 after this time. 



President P. J. Parrott: The next paper will be read by Dr. E. P. 

 Felt on "The Reactions of Sugar Maples to Miscible Oils." 



THE REACTION OF SUGAR MAPLES TO MISCIBLE OILS 



By E. P. Felt, Albany, N. Y. 

 (Withdrawn for publication elsewhere.) 



Mr. Glenn W. Herrick: Have you noticed any effect as to the 

 time of spraying and have you any data on the effect of miscible oils 

 on other trees than maples? 



Mr. E. p. Felt: Most of the injury we observed in certain cases 

 followed spraying in the fall. We have studied several apple orchards 

 where a serious condition developed, the damage being closely restricted 

 to trees or even parts of trees which had been treated with a miscible 

 oil. 



Mr. Z. p. Metcalf: Our experimental results have shown that 

 miscible oils are not the only thing that cause injury. A few years ago 

 at Charlotte, N. C, I found three trees in three widely separated local- 

 ities showing practically the same injury- to the lower branches. One 

 was a sugar maple which was not infested by insects and had not been 

 sprayed. Another a silver maple which had been sprayed the previous 



