No. 1186 THE ASTRONOMICAL JOURNAL 169 close correlation of regions of maximum band intensity with those of maximum absorption. An interstellar D-line versus X 4430 plot shows a definite correlation; however, the scatter is larger than in the case of reddening so that it may be due largely to correlation of both with distance. The data is therefore inconclusive as to the coincidence of regions where the D lines and 4430 are produced. The correlation of 4430 intensity with the intensity of the

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... fuse interstellar band at X 6284 is good. The observed data indicates that the 4430 absorption is produced largely in regions where interstellar reddening occurs, although they do not appear to result from the same agent. Therefore appreciable deviations from the average ratio of these quantities occur occasionally when large numbers of stars are considered.