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THREE-DIMENSIONAL MOTION PICTURES 71 ject is seen in the direction of the imaginary prolongation of the reflected rays at a distance equal to that of the given points so that it will appear of equal size as the object it will be erect, but reversed as to sides. Such an image has no real existence. The rays do not come from behind the mirror and cannot therefore be collected upon a screen. The real image which provokes the visual stimulus in the brain is formed by the optical system of the eye, the position of the image formed by the mirror being only an im pression having no real existence. Such an image is called virtual. Any virtual image can be made to form a real one by a suitable refraction through a convergent optical system as in t s he case of the eye above referred to. It is quite appropriate to make here a distinction between the true meaning of the word mirror and the same word as applied to describe the well known object of everyday use. A mirror, in optics, is a smooth and highly polished surface reflecting a great amount of the rays of light impinging upon it. A glass mirror is in fact composed of a mirror and a support, the mirror being- the silver or mercury surface and the glass acting as support and protection to the mirror itself. A glass mirror has two reflecting surfaces, the front face of the glass plate and the silver or mercury coating on the oppo site face. If a lighted match is placed in front of a glass mirror and is looked at obliquely, two very distinct images of the match will be seen. One of the two images is formed by reflection from the silver coating and is the brightest of the two, the other is formed by the reflection of the surface of the glass. Furthermore these two images act as luminous objects in re spect to either one of the two reflecting surfaces and other im ages of the match are to be seen which would multiply to an in finite number were it not for the absorption and scattering of the certain portion of the light which takes place at each re flection.