"... I would wish to sound a note of cautious disapproval of applications, which are being made with increasing frequency, to apportion costs according only to the success or failure of one party or the other on the various issues of fact or law, which arise in the course of a trial. ... But trials occur daily in which the party, who in the end is wholly or substantially successful, nevertheless fails along the way on particular issues of fact or law. The ultimate ends of justice may not be served if a party is dissuaded by the risk of costs from canvassing all issues, however doubtful, which might be material to the decision of the case. There are, of course, many factors affecting the exercise of the discretion as to costs in each case, including in particular, the severability of the issues, and no two cases are alike. I wish merely to lend no encouragement to any suggestion that a party against whom the judgment goes ought nevertheless to anticipate a favourable exercise of the judicial discretion as to costs in respect of issues upon which he may have succeeded, based merely on his success in those particular issues."