boiling above 203oC, Fyrene and phenanthrene were positively identified 

 in both samples. 'Ihis ■'.-'ork is continuiHg,. • 



In an effort to further detemine v/hether fundamental differences exist 

 between petroleum oils and creosote oils, dielectric- constant measurements 

 on three samples of petroleum gave values ran^;ing from 2.I4I4 to 2,69, 

 whereas creosote oils gave values of i4.5'6 to 7.9^. ^^urther, velocity of 

 sound measurements on tv/o petroleum oils vrere in the range of II476 and 

 1507 meters per second, whereas two creosote oils gave values of 1530 

 and 1^90 meters per second. 



Solvent e:ctraction studies using/-^, /,:•'■ '-o^qy-dipropionitrile indicate that 

 this solvent is very unique in its ability to separate aromatic compounds 

 with a small amount of allcyl substitution from those containing a larger 

 amount. It is also very sensitive to the presence of naphthenic groups in 

 an aromatic compound. It is potentj.ally valuable as a means of detecting 

 the presence of petroleum products in creosote oils. 



"'A portion of this work is reported in the Proceedings of the American 

 Wood- Pre servers' Association, volume h8, pages 53 to 83, 1952. Addi- 

 tional portions will appear in the Proceedings of the American Tifbod- 

 Preservers' Association, volume h9, 1953. 



