THE possibility of monochromatic radio emission from galactic deuterium has been well known for some time, and the frequency of such an emission line predicted by Shklovsky1. The expected maximum intensity is such that any attempt to detect the line must rely on extremely long integrations in time. In practice, this requires either direct electrical integrations over a long period or the manual summation of a series of individual records. One attempt to detect the line using manual methods has already been published2.