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to 3.0 foot-candles. This applies to the walls near a lamp, to the lamp itself if it is not concealed, to any diffusing globes or fixtures used, and in general to any part of the interior of the theater. For example, a sheet of white paper illuminated by a 25 watt lamp at a distance of one foot, has an apparent brightness of about 20 foot-candles. A sheet of music illuminated in this way, if visible from the audience, becomes a glare spot and may cause great dis- comfort. Arrangements should therefore be made which, while providing adequate illumination for the musicians, will prevent the illuminated sheets from being visible to the audience. Lights under a balcony are particularly bad and should be used only with a properly designed indirect lighting system. Considerable attention should be paid to the character and position of exit signs. While it is neces- sary to make such signs very conspicuous, this can be accomplished without making them so brilliant as to be- come disagreeable glare spots. The use of a projection screen set well back from the stage and shielded to a great extent from light reflected from the walls and ceiling would probably permit of even greater values of the general interior illumination than used in the tests performed by the laboratory. The results obtained in the tests indicate that the illumination should be about 0.1 foot-candles on the table plane* near the front of the theater and increase gradually to about 0.2 foot-candles near the back of the theater. It is suggested that if the lighting of the vestibule, lobby and foyer be graded so that the transition from the sun- light to the interior of the theater is made gradual, the shock to the eyes on entering and leaving the theater will be diminished. If properly designed, it is possible that the time necessary for the adaptation of the eyes to the inter- *The table plane is any horizontal surface 30 inches above the floor. The amount of illumination in a room is usually specified by measuring the illumination at the table plane for a number of difTerent points in the room.