Which preposition to use with jorums

of Occurrences 7%

For awhile, his attentions produced no effect; but presently, having bathed the lad's face with water from the sea, and rubbed rum into his chest over the heart, the youth began to show signs of life, and soon opened his eyes, whereupon the bo'sun gave him a stiff jorum of the rum, after which he asked him how he seemed in himself.

Which preposition to use with  jorums