The National Geographic Society and Cornell University have set up a three‐year comprehensive program of research on the aurora borealis, as seen in lower latitudes, 40° to 45° north. Parallactic height‐measurements are made from four stations. The base‐line, Cornell Aurora Observatory, Ithaca, New York (76° 29′ west, 42° 29′ north), to the tower of Colgate Memorial Chapel, Hamilton, New York (75° 33′ west, 42° 49′ north),is equipped with special auroral cameras with lenses of 45‐mm focus and aperture F/2. The base‐line, Fuertes Observatory, Ithaca, New York (76° 29′ west, 42° 27′ north), to Smith Observatory, Hobart College, Geneva, New York (77° 00′ west, 42° 53′ north), is equipped with auroral cameras loaned by the Auroral Committee of the International Union of Geodesy and Geophysics. Each camera takes six separate photographs on a plate 9 by 12 cm. The plates used are 1‐C special, panchromatic, and 1‐G special green‐sensitive, specially coated by the Eastman Kodak Company. These plates have greater speed and finer grain than any other high‐speed plates known to be available. About 500 photographs were taken between September, 1938, and April 24, 1939, of which about 100 pairs are suitable for heightmeasurement. No height‐measurements have yet been made from these negatives (see Fig. 1).