The following text is a suggestion regarding wording for your bequests to Louisville Seminary. You always want to consult an attorney and/or financial advisor regarding your situation.
For a contingent bequest:
"I devise and bequeath the residue of the property owned by me at my death, both real and personal, and whatever situate, to my wife (husband), _____, if she(he) survives me. If my wife (husband) does not survive me, I devise and bequeath my residuary estate to Louisville Presbyterian Theological Seminary, located in Louisville, Kentucky, for its general purposes or to be used for...".