112 4th and 5th grade children were given 5 facts to learn and remember in a science lesson. Several different kinds of presentation were employed, including massed and spaced accompanying contexts containing; (1) a related superordinate fact in the form of a topic sentence, (2) coordinate facts, (3) unrelated facts, and (4) an "isolated" presentation condition containing no context facts. Retention of the facts was measured primarily by recall scores obtained by having Ss complete blanks in paraphrased sentences. Results indicated significant effects of the variables of school grade and type of context, but no significant effects of massed vs. spaced presentation. Most favorable condition for recall was 1 with no context during learning. Superordinate context was superior to coordinate, and this in turn superior to unrelated context. Results indicate the operation of interference, and also of organizing factors, in the determination of retention.