1. The reversing effect of photographic pictures is very intense by violet and blue rays, and becomes gradually less as the refrangibility of the rays decreases.
2. The effect of photographic reversal increases with the intensity of light of the second exposure, and reaches a maximum at a certain intensity, after which it remains constant; but the photographic film becomes wholly dark for the stronger intensity.
3. The effect of reversal increases with the duration of the second exposure; but after reaching a maximum value, it does not increase any further. The photographic film becomes wholly dark for the longer duration of exposure.
4. The photographic negative (not fixed) obtained by weaker light and by shorter duration of the first exposure, becomes positive easily by weaker light and shorter duration of the second exposure than that obtained by the stronger light and by the longer exposure.
5. There is no decrease of the effect of reversal by superposing green and red rays upon violet and blue ones, even though the intensity of these rays is stronger than that of violet and red rays.
6. So far as the present investigation is concerned, the less refrangible rays do not counteract the more refrangible ones for the reversal of photographic pictures, as Lüppo-Cramer believed.

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