PROTECTING WOODS AGAINST TERMITES. 7 



cially Eucnemidae, 2 as well as fungi. The tips of many treated stakes 

 were badly checked at the last examination in 1922. 



Table 2. — Chemical analyses of oils B or No. I 1 and A or Xo. 2 2 made T)y the 



manufacturer. 





1, B. 



2, A. 



Standard distillation (totals by weight): 



170° 







0.3 



8.0 

 39.2 

 42.6 



9.2 



1.047 



8 

 30.08 







200° 



1.1 



210° 



8.1 



235° 



46.7 



315° 



32.5 



355° 



6.4 





1.044 





per cent. . 



23 





do 



25.00 







1 Fraction 210°-235° C. solid at laboratory temperature. 



2 All fractions liquid excepting 315°-355° (which contained anthracene). 



Note. — Dry naphthalene represents solid matter at 15° C, but if cooled to zero sufficient solid matter 

 would be obtained to bring it at least to 40 per cent. The percentage of solids in oil can be increased by 

 lowering the temperature, and a 40 per cent naphthalene oil had been desired in the case of No. 1. 



Oil No. 1 (B) was intended for an oil high in naphthalene with a normal tar-acid content, whereas 

 oil No. 2 (A) was intended for an oil high in tar acids with normal naphthalene content. 



Pine-tar* oil ; i. e., wood creosote (Misc. Div. No. 15787) : 

 Appearance, Dark brown, slightly viscous liquid. 

 Odor, Pine-tarry and enipyreumatic. 



Specific gravity 29° C 1.0285. 



Pyridines Traces only. 



Water and pyroligneous acid Traces only. 



Mineral oils None. 



Ash 0.4 per cent by weight. 



Volatile oils excluding phenolic bodies (tur- 

 pentine, pine oil, and apparently traces of 



rosin spirit) 12.S per cent by weight. 



Phenolic bodies (guaiacol, etc., volatile tar 

 acids from wood tar, creosote, essentially 



free from coal-tar acids) 11.9 per cent by weight. 



Bodies not distilling below 360° C. (pitch, 



very heavy oils, etc.) 10 per cent approximately. 



Rosin oil and other heavy pine-tar oils (by 



cliff.) 64.9 per cent 



Behavior on distillation : 



100° C. to 155° C 1.5 per cent by volume. 



155° C. to 180° C 4 per cent by volume. 



180° C. to 210° C 16 per cent by volume. 



210° C. to 230° C 11 per cent by volume. 



230° C. to 270° C 16.5 per cent by volume. 



270° C. to 360° C 42 per cent by volume. 



Pitch, loss, etc. (by diff. ) 9 per cent by volume. 



Consists essentially of the so-called heavy oil 

 obtained in pine-tar distillation. 



Twelve stakes were impregnated by the full-cell pressure process 

 with creosote oil (Oil B or No. 1, see analysis, Table 2, p. 7) contain- 

 ing a high percentage of naphthalene; 12 stakes were impregnated 

 with a creosote oil (Oil A or No. 2, see analysis. Table 2, p. 7) con- 

 taining a high percentage of tar acids; 12 stakes were impregnated 

 with wood creosote (see analysis, Table 2, p. 7. Xo. 15787) ; 12 stakes 

 were impregnated by the Rueping (empty-cell) pressure process with 

 creosote Oil A or No. 2; 12 were impregnated with creosote Oil B 

 or No. 1, and 12 impregnated with wood creosote. There were 72 

 treated stakes in all. In addition, 12 stakes were treated to refusal 



2 Especially Dromaeolus striatus Lee. 



