SUMMER MEETING. 29 



trees were freed in one season from the wooly-aphis by means of the 

 tobacco dust alone. 



Through the kindess of Col. J. C. Evans and Dr. Paul Evans, we 

 were enabled to conduct experiments on the wooly-aphis in the ex- 

 tensive apple orchards of the Old Fruit Farm. These gentlemen also 

 kindly placed at our disposal a reliable assistant, and aided the experi- 

 ments in every possible manner. 



For the tobacco experiment fifteen young bearing apple trees 

 that were suffering more than the others from the wooly-aphis, were 

 selected. Each tree had the earth removed from around the trunk for 

 a distance of two feet and about four inches deep. Tobacco dust was 

 then evenly distributed in each of these excavations and covered with 

 the earth. The amount of tobacco dust used was three, four and five 

 pounds, each to five trees respectively. These trees were thus treated 

 on the twenty-second of June ; and an equal amount was placed around 

 them again on the fifteenth of August. In company with Col. J. C. 

 Evans and two other gentlemen, I visited and carefully inspected these 

 trees on the twenty-fourth of October. The earth was removed from the 

 main roots around and under the base of the trees as far down as was 

 practicable and necessary in order to ascertain the results of the ex- 

 periment. In no case could a single wooly-aphis be found, not even 

 under the trunk and in the sheltered places, whereas they had appeared 

 in immense numbers when removing the earth to first apply the tobacco 

 dust. 



When first applying the tobacco dust to some of these trees, they 

 looked so sickly, and were so badly infested that the gentlemen assist- 

 ing me said it would be a miracle if they did not soon die in spite of 

 anything that could be done. Some of them appeared to be more 

 dead than alive, but they all lived and recovered. Not a treated tree 

 was lost. 



Thus it will be seen that the results of this experiment fully con- 

 firm the results obtained in Judge Wilkinson's orchard. 



Having killed the trees treated with carbon bisulphide in Judge 

 Wilkinson's orchard, and profiting by that experience, the following 

 experiments were undertaken in a young bearing apple orchard on the 

 Olden Fruit Farm : 



On the 25th of August, thirty very badly infested apple trees were 

 selected, and carbon bisulphide injected into the earth at the roots of 

 each of the trees by means of the injector, and in the following man- 

 ner: Five trees each received one fluid ounce of the liquid injected 

 one foot away from the trunk on three sides, and five other trees each 

 received the same treatment, except that the liquid was injected two 



