Which preposition to use with inkhorn

at Occurrences 1%

Cotton Mather came posting down All the way to Newbury town, With his eyes agog and his ears set wide, And his marvellous inkhorn at his side; Stirring the while in the shallow pool Of his brains for the lore he learned at school, To garnish the story, with here a streak Of Latin, and there another of Greek: And the tales he heard and the notes he took, Behold!

Which preposition to use with  inkhorn