Which preposition to use with saltum

from Occurrences 2%

Even were we rash enough to pronounce progress to be on the whole prevalent within the narrow field of our own experience, surely it were nothing but the inevitable "provincialism" of the human mind to pass per saltum from that, to a generalization for all possible experience.

in Occurrences 1%

Some add palpitation of the heart, cold sweat, as usual symptoms, and a leaping in many parts of the body, saltum in multis corporis partibus, a kind of itching, saith Laurentius, on the superficies of the skin, like a flea-biting sometimes.

Which preposition to use with  saltum