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o THREE-DIMENSIONAL MOTION PICTURES quency and the time has been fixed to a second. The second entity is the number of waves contained in a cer tain fixed distance between two points of the train of waves. This distance has been fixed to the centimeter and the attribute is called the wave number. LUMINOUS AND NON-LUMINOUS BODIES All bodies can be divided into two classes, luminous and non- luminous. As we have stated bodies become luminous under the influence of some action of physical or chemical order. A body is then said to be luminous when this influence is acting upon it and is thus creating the light energy. Bodies in the non-luminous state are said to be transparent, translucent or opaque. Substances that readily permit the transmission of light and through which objects may be seen are called transparent. Gases, clear water, polished glasses are transparent bodies. Substances which transmit light, but through which objects cannot be distinguished, are called trans lucent. Ground glass, porcelain, etc., are translucent. Substances which do not permit the transmission of light are - called opaque. Metals, wood, stone, etc., are opaque bodies. There are no perfectly opaque nor perfectly transparent bodies. Consider, for instance, water as a highly transparent substance. A sufficient thickness of water, no matter how pure it may be is quite impenetrable by light and, on the other hand, when gold is reduced to a very thin leaf, it transmits a green light. It is quite evident that if an energy or force propagated by a constant motion in a certain definite direction meets an ob stacle in its course something is bound to happen. When a rubber ball is thrown against a wall, it rebounds from it with a speed almost equal to the speed imparted to it by the thrower. A stone thrown against the same wall also rebounds from it, but at a speed greatly less than that of the rubber ball. If a stone is thrown into water it goes through the water but its