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PICTURES 55 and their constant replacement by new waves. The dying away and replacement of waves results In a re tardation of their velocity. A group of waves moves at a lesser speed than the individual wave and Its speed Is inversely proportional to the density of the medium, The change in velocity Is cause of a change of direction of the light ray and this change of direction takes place at the surface of the second medium. From this surface the light travels in a straight line throughout the medium, providing the latter Is homogeneous. WHENEVER an object which is either luminous or is stricken by light emanated by a luminous body is presented to the eye the radiations that it emits as in the first case, or the ones that it reflects, as In the second case, produce the sensation of vision and the object Is said to be seen. When the rays emanated from the object enter the eye they suffer a series of refractions and an image of the object is formed upon a very sensitive membrane In the eye called the retina and is transmitted to the brain by some quite unknown physiological and psychological processes. The image of the object is a reproduction or counterpart of the object itself, or better, a reproduction of each and every one of the points of the object from which a ray of light is emitted so it may reach the eye without encountering any ob struction in Its path. The image formed upon the retina Is a purely physical one and the conditions necessary for its formation and for the for mation of similar images have been known and studied for sev eral centuries. When an image is formed by a suitable combination of lenses so that it can be collected upon a screen, each point of the screen radiates reflected rays of light of different intensity and color, according to the rays forming the image itself, and if the eye is so placed as to receive these rays it will form on the retina a counterpart of the image and therefore a counterpart