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3 times with cyclohexane (each time

100 nil.). The combined cyclohexane layers were concen- trated to

100 ml, by evaporation under re- duced pressure, and this solution was subse- quently extracted

5 times with nitrornethane (100 nil. each time). All solvents used were pre-equilibrated. Column Chromatography. The residue of No,

1 AIRPOLLUTION CARCINOGENESIS. 11. - Hoflmann &

Wynder

95 I I : - L

1 0 I I

200 250 3LD L

400 450 I I

1 I I I

200 250

300 350

400 4x) FIG.1. Ultraviolet absorption spectra for benz[aJanthracene and an unknown compound isolated from gaso- line engine exhaust condensate. Curve Ia is for benz[a]anthracene in a concentration of 19.0 mg. per liter;

curve Ib is for benz[a]anthracene in a concentration of

4 . 1mg. per........