. . . . "By the thirteenth section of a statute of Illinois in force on and after February 12, 1857, entitled 'An act to amend the interest laws of this state,' it was provided: 'Where any contract or loan shall be made in this state, or between citizens of this state and any other state or country, bearing interest at any rate which was or shall be lawful according to any law of the state of Illinois, it" . .