any person who entered the wharf, whether through the turn-
stile or from a boat, would be prevented from leaving through
the turnstile unless he paid a penny. That was a reasonable
condition to impose under the circumstances, because it would be
impossible for the appellants to carry on their business if it were
necessary to inquire of each person whether he had actually
travelled by boat or not. The respondent, therefore, when he
entered the wharf, knew, and accepted as an implied term of the
contract of carriage, that he would have to submit to such
detention if he failed to carry out his part of the contract.
There was no imprisonment, because he could have left the
wharf by water: Bird y. Jones (4). The assault proved was
not greater than was necessary to prevent, the respondent from
leaving, and was, therefore, only such as the respondent must
have contemplated as likely to be used in case he should fail to
carry out the contract to pay the second penny. Even if this
defence amounts to leave and licence, it was open to the de-
fendants under the plea of the general issue: Bullen and Leake,
Precedents of Pleadings, 3rd ed., p. 792, citing Christopherson v.
Bare (5). A verdict should be entered for the defendants with-
out a new trial.