Which preposition to use with sickliness

of Occurrences 3%

The sickliness of their climate for invaders would prevent their being made an object.

in Occurrences 1%

But there is no sickliness in his poetry, and he retained a charming playful humordisplayed in his excellent comic ballad John Gilpin; and Mrs. Browning has sung of him, How, when one by one sweet sounds and wandering lights departed, He bore no less a loving face, because so broken-hearted.

Which preposition to use with  sickliness