280 ILLINOIS STATE ACADEMY OP SCIENCE 



necessarily all be manifested as absorption bands in a 

 single gas. 



The evidence supporting such a theory is very meager, 

 and this investigation was undertaken in an attempt to 

 add more data to the general problem. Accordingly the 

 absorption of NO, NO2, N2O4, and N2O was investigated 

 by means of a grating spectrometer and a radiometer 

 in the region from 1 u to 4.5 u. A large number of new 

 bands was found in each case in this region. No attempt 

 has yet been made to apply the theory which has already 

 been developed. 



