1. Potassium Sulphide, saturated solution. 



2. Hydrogen " " " 



3. Ammonium " " •' 



After forcing in all the liquid the plant would take (about a tube- 

 ful) the holes were plugged with hard grafting wax. 



Observations were made from time to time with the following re- 

 sults : At first a slight improvement was noticed in the amount of 

 mildew upon the foliage, but as the season advanced, the effect of 

 the holes made in the trunk became more apparent, so that Sept. 

 22d, all the bushes were dead except one of those treated with am- 

 monium sulphide. 



This experiment was made in part to demonstrate the great 

 injury that must result in making large incisions in the trunks 

 of trees or shrubs, and that while there is some promise that the in- 

 troduction of antiseptics into the circulation of the sap may prevent 

 the growth of injurious fungi like the blights, mildews, etc., we 

 must find other means of introducing the solutions. 



From the ver}' nature of the case presented, it seems hardly possi- 

 ble to introduce any substance into the circulation of a plant in suffi- 

 cient quantities to affect insect life, and no experiments were under- 

 taken in this line. 



