the property of radiation by which chemical effects are produced.
Historical Examples

In summer, when the maturing process advances, light and heat increase, and actinism relatively declines.
The Reason Why Anonymous

In the autumn, when the ripening period arrives, light and actinism give way to a greater ratio of heat.
The Reason Why Anonymous

The third constituent of the sunbeam is actinism—its property being to produce chemical effects.
Harper’s New Monthly Magazine, No. XXVI, July 1852, Vol. V Various

As yet, the effects of actinism have been more studied in the inanimate than the organic creation.
Harper’s New Monthly Magazine, No. XXVI, July 1852, Vol. V Various

Because blue glass obstructs many of the luminous rays, but it is perfectly transparent to actinism.
The Reason Why Anonymous

Experiments clearly prove that this change is to be attributed to actinism, and not to heat.
Harper’s New Monthly Magazine, No. XXVI, July 1852, Vol. V Various

actinism, ak′tin-izm, n. the chemical force of the sun’s rays, as distinct from light and heat.
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various

An instrument for registering the intensity of the chemical influence (actinism) of the suns rays.
Cooley’s Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades…, Sixth Edition, Volume I Arnold Cooley

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