298 Agkicultufal Eypeeiwekt Station, Ithaca, !N. T. 



The potaph dissolves readily in water and the solution -was applied 

 to the varieties of plants mentioned under No. 7. The application 

 appeared to reduced the amount of leaf-spot on the quince about 30 

 per cent and the dewberries were protected from about 25 per cent of 

 the injury visible on the check plants. The other plants which were 

 sprayed showed no effects of the application. No foliage was injured. 



Caustic potash may have some fungicidal value. 



ISfo. 11. — Pine products. — In April, 1892, we received from S. L. 

 Goodale, of Saco, Maine, some abretic acid, and some kreolin, two sub- 

 stances derived from pines. As the amounts received were small the 

 following formulas do not include so much of the materials as might 

 be desired. Two ounces of kreolin were dissolved in one pint of water. 



(a) Abretic acid solution, 1 tablespoonful. 

 Water, 1 gallon. 



(b) Kreolin solution, 2 tablespoonf uls. 

 Water, 1 gallon. 



None of the treated plants, these being the same as those mentioned 

 under No. 7, showed any effects of the application. No foliage was 

 injured, and fungi were as abundant as upon the check plants. 



The application of pine products appeared to be without effect. 



No. 12. — Antinonnin. — This substance is sold as an insecticide and 

 was sent us by the manufacturers, Friedr, Beyer & Co., of Elberfeld, 

 Germany. It is said that this compound was discovered by Prof. O. 

 Harz and W. von Miller, of Munich, Germany. Antinonnin is a solid 

 having about the same consistency as fresh cheese. It is bright golden- 

 yellow in color, very easily soluble in water, and when dry is highly 

 explosive. Consequently it must be kept in a moist place for if fire 

 reaches it when once dry it will ignite almost as readily as gunpowder 

 and it burns very much in the same manner. The station chemist has 

 not yet completed its analysis, but it is supposed to be an organic 

 compound. It was used at the rate of 



(a) Antinonnin, \ ounce. 

 Water, 1 gallon. 



(b) Antinonnin, \ ounce. 

 Lime, \ ounce. 

 Water, 1 gallon. 



The applications were made to Longfield apple trees. Champion 

 quince, and to the same varieties of plants mentioned in addition under 

 No. 7. After the first application it was immediatelj' seen that the 

 above formulas gave a too concentrated solution, go the same amount of 



