EXPERIMENTS WITH SPRAY 'SOLUTIONS f.0$ QFEEN LOGS. 9 



One per cent sodium arsenate Svttftioh' JUniper logs dipped and exposed 

 against insects of types 1 and 4 were not attacked after 60 days. ^ 



Sixteen parts of 1 per cent sodium arsenate and one part of a commercial 

 miscible oil. Juniper dipped in this mixture was not attacked after 60 days, 

 but dipped pine was heavily infested by type 4 after 15 days. 



Stock solution of kerosene emulsion, the water used containing 2 per cent 

 sodium arsenate. Pine and hickory logs, sprayed, were attacked by all types 

 possible. The final results were no better than with the controls. 



One ounce of sodium arsenate dissolved in one pint of alcohol and added to 

 one and one-half gallons of kerosene. Very little arsenate went into solu- 

 tion. Pine logs, sprayed and dipped, were heavily attacked after 30 days 

 by insects of type 4 and later by all types. Final results were but little better 

 than in controls. Ash logs, sprayed and dipped, were attacked by one insect 

 of type 1, but the final condition was much better than with the controls. 

 This treatment was repeated on June 1 under similar conditions and with 

 similar results. 



One part arsenic acid to nine parts water followed by lime water (arsenic 

 acid 30 per cent AS 2 Os by weight, 8. G. 1.3000, prepared by Insecticide and 

 Fungicide Board. Pine and ash logs were dipped. The pine was not attacked 

 until 60 days and then by only a few insects of type 4. The ash was not 

 attacked. This treatment, under similar conditions, was repeated June 1, and 

 there was no attack after 60 days. 



One-fourth ounce of corrosive sublimate dissolved in two and one-half ounces 

 of alcohol and added to one and one-half gallons of kerosene. Pine and ash 

 were sprayed and dipped. The pine was first attacked after 40 days by a few 

 insects of type 4 ; there was no other attack. The ash was not attacked. This 

 treatment, repeated June 1 under similar conditions, gave the same results. 

 Although these logs were not attacked by Monohammus of type 2, it is hardly 

 safe to conclude that this treatment would always be effective against them. 



Saturated solution of sodium fluorid. Pine, ash, and hickory were sprayed 

 and dipped. There was no attack for 30 days, and then the logs were infested 

 by all types, though to a less degree than the controls. Little bluing was noted 

 on pine. Although not altogether successful, this solution is worthy of further 

 trial. This treatment, repeated June 1 with conditions as before, gave like 

 results. 



Saturated solution of sodium fluorid, 20 parts to one part of a commercial 

 miscible oil. Pine logs were dipped and sprayed with results as in the pre- 

 vious experiment. 



Three ounces of zinc chlorid dissolved in three ounces of alcohol and added 

 to one and one-half gallons of kerosene. Pine and ash sprayed and dipped. 

 The pine was attacked after 30 days by insects of type 4 and later by all types. 

 Ash was not attacked by type 1. June 1 the treatment, under the same condi- 

 tions, was repeated with results as before. 



Five and ten per cent crude carbolic acid 3 in water. Pine logs, sprayed and 

 dipped, were immediately attacked and heavily infested by all types. The 

 final results were no better than with the controls. 



Two and one-half per cent solution crude carbotic acid in water, eight parts 

 to one part of a commercial miscible oil. Treatments and results as in the pre- 

 ceding paragraph. 



Six ounces of carbolic acid in one gallon of kerosene. Pine, sprayed and 

 dipped, was attacked after 30 days by all types. The final results were no 

 better than with the controls. 



3 Coal-tar oils and acids, 97 per cent ; inert matter, 3 per cent. 



