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The infra-red and Raman spectra of ethylene imine and ethylene sulphide have been measured. The use of higher resolving power has revealed the rotational contour of many of the infra-red absorption bands, and this has been correlated with the molecular moments of inertia and symmetry. An attempt has been made to determine the magnitudes of the fundamental vibration frequencies of these molecules and to compare them with those suggested for ethylene oxide in a previous paper.