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PLATE 33-When taking records with the micrograph 1 it was observed that in some instruments the direction of motion of the interference' bands of light for an increase of air pressure was opposite to, the direction of motion in other instruments. In some the diameters of the circular bands contracted as the two interference plates approached each other, while in others they expanded. Ordinary spectacle lenses were used, and the facts are explained by supposing that the surfaces were curved instead of being plane. It will be shown that there is a critical value of the curvature of the interference surfaces, and when the curvature is greater than the critical value, the bands move in one direction, but when less, they move in the opposite direction. A photograph of interference bands formed between two pieces of plate glass (eight by ten inches), the upper resting upon the lower by its own weight, is reproduced in figure I, and shows two characteristic kinds of areas that usually appear when two pieces of common glass are placed together. The first kind of area, A. is surrounded by bands in closed curves, which often approximate an elliptical shape. The second kind of area, B, is characterized

ON THE DISTRIBUTION AND DIRECTION OF MOTION OF THE INTERFERENCE BANDS OF LIGHT FORMED BY THIN PLATES AS THE THICKNESS OF THE PLATE VARIES