These experiments investigated the relations between immediate recall of visually presented digits, letters, colors, and shapes and various methods of presentation, in order to illustrate the use of a simple equation which gave a quantitative analysis of the factors involved. This analysis was based on the assumption that the whole of the recall task involved a constant amount of a quantity called the A-factor. Experiment I compared Single and Block presentation at three speeds (0.25 to 1 sec./item); Experiment II studied Single presentation at slower speeds (1 to 2 sec./item) with shorter messages. Experiment III studied Block presentation at exposures from 0.1 to 6 sec. Eight S s, housewives, were used for each experiment. The speed of reading the materials was measured. There was a positive correlation for each S between the various measures. Experiment IV examined the effect of message length up to 20 letters upon the recall of letters. The S s were 12 school girls. The relation between message length and recall could be regarded as a rapid loss of most of the message, followed by a slow loss of the last few items. A linear equation seemed to be a reasonable fit for the first part of the curve. This was Ma + Ns = 100, where M = number of items given, and N = number of items recalled. Experiment V examined the effect of message length upon recall of the four materials. The S s were ten schoolgirls. The recall loss due to excess material was approximately linear and parallel for the four materials. It was concluded that report from the 0.1 sec. exposure was made from a rapidly decaying pre-perceptual visual image, and was limited by the speed of recognition, which itself was limited by the same difficulties that affect the post-perceptual immediate recall.