Crossword-Solution: RADIATIVE 9 letters, 2 clues 🏆 scrabble score: 13

There may, further, be cases where the effects of luminous radiative repulsion become apparent, and also Crookes’ vacuum-effects described as “radiant matter.” Nor is it quite certain that Laplace’s proofs of the instantaneous propagation of gravity are final.

And its warrant may perhaps consist in a preponderance, among suns endowed with high _physical_ speed, of small or slightly luminous over powerfully radiative bodies.

The following letter to Meldola refers to a suggestion that the white colour of the undersides of animals might have been developed by selection through the _physical_ advantage gained from the protection of the vital parts by a _lighter_ colour and therefore by a surface of less radiative activity.

The whole matter is of more practical importance than appears at first sight, for the photoelectric nature of the effects involved in the radiative treatment of many cruel diseases seems to be beyond doubt.

Both surfaces appear to be metallic; what, then, is the cause of the observed difference in their radiative power? Simply this: one of the surfaces is coated with transparent gum, through which, of course, is seen the metallic lustre behind; and this varnish, though so perfectly transparent to luminous rays, is as opaque as pitch, or lamp-black, to non-luminous ones.