FOLLOWING the meeting held by the International Telecommunications Union in Atlantic City in 1947 (see Nature, May 29, 1948, p. 863), a series of subsidiary conferences is being held in various parts of the world to deal with the allocation of radio wavelengths for various purposes. According to The Times, a three-months conference in Copenhagen has just reached agreement on a new plan for the distribution of the long and medium wave-bands for European broadcasting stations. The new convention, which has been signed by twenty-five countries, will come into effect in March 1950, and will mean that many of the B.B.C.'s transmitters will have to change their operating frequencies. The allocation of short waves for sound broadcasting purposes will be decided by a conference which is to meet at Mexico City on October 22.