c=3St=s« 
484 
DR. WALTER NOEL HARTLEY ON THE ABSORPTION SPECTRA 
Map of Absorption Bands. 
The Absorption Spectrum of Benzene Vapour Drawn to a Scale of Oscillation Frequencies and the Bands Divided 
into Four Series. 
(pO U-COO 
too 
so t+ZOO 
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SO 4-300 SO 4 J +00 so *Soo 
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1 
1 
i 
n 
m 
IV 
V 
I. The whole spectrum. III. Second series, strong bands. 
II. First series, strong bands. IV. Third series, weak bands. 
V. Fourth series, weak bands. 
The Absorption Bands in the Least Refrangible Rays Observed at Reduced Pressures varying from 
206 mm. to 37 mm. at a temperature of 100 C. 
^ 0 w ~ 
