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THREE-DIMENSIONAL MOTION PICTURES ^ two points when these are at a distance apart which subtend a visual angle greater than one second or 1/60 ol a degree. Suppose the two points placed at a and a' to be such a dis tance from the eye e that the angle a e of is the resolving angle. The two points b and b f set at a greater distance from the eye, must be further apart from each other to be still distinguished by the eye as two separate points. Several practical experiments will demonstrate the phe nomenon. Suppose a street lined on one side by a series of brick build ings. If we look up the street we clearly distinguish on the nearby buildings the lines of separation of the bricks, especially if these are held together by white mortar. The further the buildings are from the eye the more difficult it is to distinguish the separation and at a certain distance the walls of the build ings will appear of a uniform red hue. Leaves of trees are perfectly discernible from a certain dis tance but such distance can be found at which the whole tree will appear as a mass of green and the leaves will no longer be distinguishable. A roughly plastered wall will appear as a smooth surface if looked at from a certain distance and so forth. Many examples can be cited even to those involving such great distances as the interplanetary ones. Two stars, for instance, may be at a tremendous distance from each other and yet will appear to the naked eye as a single luminous point. The plurality of stars can only be determined by the use of powerful telescopes. Although the distance between two stars may be several millions of miles the still more enormous distance at which they are from the earth makes their separation to be within the an gular limit at which the eye loses its resolving power. It results that if the discs of confusion which concur to form an image are sufficiently small so that they do not impair the fine details of the subject enough for the eye to resolve such im pairment, the lack of definition which is caused by the discs