8 BULLETIN 1079, U. S. DEPARTMENT OF AGRICULTURE. 
- Coal-tar emulsion (prepared by Insecticide Board); 1 part emulsion to 10 
parts water.—Pine logs dipped and sprayed were attacked after 15 days by 
insects of type 4 and later by those of all types. Final results were no better 
than in the case of the controls. 
Crude petroleum.—Pine logs sprayed and dipped with crude petroleum were 
attacked by insects of type 4 after 15 days and later by those of all types. 
Final results were no better than with the controls. : 
Anthracene oil emulsion (prepared by Insecticide Board); 1 part emul- 
sion to 10 parts water and 1 part emulsion to 100 parts water.—Dipped pine 
logs were attacked by insects of type 4 after 15 days and later by those of all 
types. The final results were no better than with the controls. : 
Crude solvent naphtha.—Pine logs dipped with this material were slightly 
attacked by insects of type 4 after 15 days and later by all types. Final 
results were but little better than with the controls. 
Six ounces of nitrobenzene in one gallon of kerosene.—Pine logs sprayed 
and dipped were attacked after 15 days by a few insects of type 4 and later 
by more of the same type. The final results were somewhat better than with 
the controls. 
Fish oil.—Pine logs sprayed and dipped were immediately attacked by 
insects of type 4 and later by all types. Final results were no better than 
with the controls. 
Two parts fish oil, one part pine oil, and three parts kerosene—Pine logs 
sprayed and dipped were attacked after 15 days by insects of type 4 and later 
by all types. The final results were no better than with the controls. 
Kerosene —Pine logs sprayed and dipped were attacked after 15 days by 
insects of type 4 and later by all types; results were no better than with the 
controls. | 
Sulphite concentrate (furnished by a paper-pulp mill); full strength and 
diluted with equal parts of water.—Pine logs dipped were attacked after one 
week by insects of type 4 and later by all types. Final results were no better 
than with the controls. 
Spent sulphite; full strength and equal parts spent sulphite and a commercial 
miscible oil——The results in pine logs dipped and sprayed were the same as 
with sulphite concentrate. 
Tree gum (furnished by Gipsy Moth Laboratory); 1 pound of tree gum 
dissolved in 1 quart of turpentine.—Pine logs treated with a brush were at- 
tacked by a few insects of type 4 after two months. The results were much 
better than on the controls, but the material held moisture in the log and pro- 
duced much bluing of sap when insects penetrated the bark. The sticky film 
acted as a mechanical barrier. 
~ One pound of melted paraffin with one gallon of gasoline added.—Pine, ash, 
and juniper logs were sprayed and dipped and placed in a cage for experiment 
against insects of type 4. This treatment prevented all attack on the more 
absorbent bark of ash and juniper. <A few insects attacked the pine. 
One-half pound of naphthalene dissolved in one gallon of gasoline-—Dipped 
pine logs were attacked after 15 days by insects of type 4 and later by all. Final 
results were but little better than with the controls. The naphthalene soon 
evaporates and no odor is left. 
One pound of melted paraffin with one-half pound of naphthalene and one 
gallon of gasoline added.—Pine, ash, and juniper sprayed and dipped and 
placed in a cage against type 4 were attacked by insects of this type after 30 
days. 
