An analysis is given of solar radio emissions, observed mainly at a wave-length of 4.1 metres between 1946 March and 1947 September, and their relation to visual solar phenomena and their geophysical accompaniments. The associations of solar radio bursts with flares are considered in detail and it is shown that the most intense flares are the most likely to produce radio bursts. It is also shown that in general the radio emission lags by several minutes behind the visual or ultra-violet flare radiations. The apparent tendency for coincidences between flares and bursts to be greater on the eastern than on the western half of the Sun's disk is discussed. The distribution of coincidences with respect to solar longitude from central meridian is contrasted with the sharply-beamed pattern of continuous radiation associated with sunspots.