Which preposition to use with actualize

in Occurrences 2%

We think that nature has typical forms hovering before it, which it is seeking to actualize in things; when this intention is apparently fulfilled we speak of things as perfect and beautiful; when it fails, of imperfect and ugly things.

at Occurrences 1%

It is thus at all times in many possible connexions which are not necessarily actualized at the moment.

Which preposition to use with  actualize