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Rh are not without influence on certain phenomena of animal and vegetable life.

The following are further observations concerning the strengthening action of "N" rays on luminous rays.

It is sufficient for the production of the phenomenon that the "N" rays reach the eye, no matter how, even laterally. This seems to indicate that the observer's eye behaves like an accumulator of "N" rays, and that it is these rays accumulated in the media of the eye which act on the retina, jointly with luminous rays.

It matters little whether in these experiments the rays are emitted by a body previously exposed to the sun, or are primary rays, produced for instance by a Nernst lamp.

Sodium hyposulphite, whether solid or dissolved in water, constitutes a powerful accumulator of "N" rays.