Which preposition to use with reagents

to Occurrences 3%

Nature is always applying her reagents to character, if you will take the pains to watch her.

for Occurrences 2%

The stomach cell may, therefore, be regarded as a test-reagent for the different internal secretions, as they affect the check and drive systems.

of Occurrences 2%

Justice should give fair credit to all the organs which fabricate the reagents of individuality, and the regulators of personality.

in Occurrences 1%

Each gland is thus influenced and influencing, agent and reagent in the complex adjustments of the organism.

Which preposition to use with  reagents