The Spectrum of NML Cygnus from 2.8 to 5.6 Microns

Observations of the infrared spectrum of NML Cygnus have been made from 2.8 to 5.6 ,~ with a resolution of approximately &~./X = 002. The object has been observed twice, first in June 1967 and then with improved technique in June 1968. Both observations appear to indicate a possible weak absorption band at X = 3.0 ~ Possible origins of such a band are discussed