The Court held for the ship owner, ruling that there was an implied term that the wharfingers had taken reasonable steps to ascertain the state of the riverbed adjacent to the jetty (not, as often stated, an implied term that the jetty would be a safe place to dock).

[2] If the wharfingers had taken such responsibility, then they would have discovered the ridge of rock and would have been under the duty to warn the shipowners of the potential hazard.

Therefore, this very restricted term was sufficient to provide protection to the shipowners as it would have been necessary to give the contracted business efficacy.

An implied warranty may be read into a contract for reasons of "business efficacy", and in order to maintain the presumed intention of the parties.

As Bowen LJ said: In business transactions such as this, what the law desires to effect by the implication is to give such business efficacy to the transaction as must have been intended at all events by both parties who are business men; not to impose on one side all perils of the transaction, or to emancipate one side from all the chances of failure, but to make each party promise in law as much, at all events as it must have been in the contemplation of both parties that he should be responsible for in respect to those perils or chances.Bowen LJ looked at the presumed risks of the agreement and who was expected to bear them.