Which preposition to use with designings

of Occurrences 8%

All that is of English growth in Sir Courtly Nice is admirable; for though it has neither the fine designing of Ben Johnson, nor the masculine satire of Wycherley, nor the grace, delicacy, and courtly air of Etherege, yet is the dialogue lively and spirited, attractively diversified, and adapted to the several characters.

on Occurrences 1%

I was overjoy'd to be thus revenged on him, for designing on my Fortune; and finding it was in my Power to make his Heart ake, I resolved to compleat my Conquest, and entertain'd several other Pretenders.

Which preposition to use with  designings