Abstract
Work done with the recording spectrometer at the University of Michigan has shown near the wave-length 16.1μ an absorption band of ammonia not hitherto observed in detail, and bands due to methyl bromide and methyl iodide, near wave-lengths 16.4μ and 18.8μ respectively. It has also shown the strong absorption band due to carbon dioxide near 15μ to be more complex and extensive than has previously been indicated.

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