| Summary: | An analysis has been made of spread-F data obtained from I.G.Y. f{hook}-plots for several ionosonde stations grouped about longitude 75°W to establish whether there is any connexion between the incidence of the frequency-spreading component of spread-F and the height of the F2-layer. It is found that the percentage occurrence of frequency-spreading is greater the greater the height of the layer. This tendency is most pronounced in the equatorial and auroral regions and is found to be independent of season, time of day, and magnetic activity. Saturation of the direct relationship between percentage occurrence and F2-layer height is found to occur at heights ranging from 200 km at Baker Lake to 550 km at Huancayo. This association between the percentage occurrence of frequency-spreading and layer height appears to be independent of the association between the percentage occurrence of frequency-spreading and f{hook}F2 reported in a companion paper. Discussion of these results is postponed to a later paper in the series.
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