Given the following context:

Many in the crowd disagreed with the decision and took exception to it being made by an umpire employed by the Englishmen. That Coulthard was a Victorian added to the emotions of the crowd, who thought along intercolonial lines. The Sydney Evening News propagated rumours that Coulthard had placed a large bet on an English victory, something that the umpire and Lord Harris later denied. Loud hooting came from the pavilion, especially the section where the gamblers, who had overwhelmingly backed a New South Wales victory, were situated. It was reported that well-known gamblers were prominent in inciting the other members of the crowd, amid loud chants of "not out" and "Go back [to the playing field], Murdoch". Gregory was later accused of trying to fan the dispute and encourage the crowd to gain an advantage for his team. The crowd was already suspicious of Coulthard's competence and impartiality; the Sydney Morning Herald commented in that morning's edition, "The decision [to give Lord Harris not out on the first day] was admittedly a mistake".The pavilion stood at an angle to the crease, so the members were not in an ideal position to see how accurate the decision was. The uproar continued as it became obvious that no batsman was coming out to replace Murdoch, so Harris walked towards the pavilion and met Gregory at the gate, at which point Gregory asked Harris to change his umpire. Harris refused, as the English team considered the decision to be fair and correct. Lord Harris later said that his two fielders in the point and cover positions, being side on to the crease, had a good view of the incident, and that they agreed with Coulthard's judgement. Barton said that Coulthard's decision was correct, and that the Englishmen were justified in standing by their nominated umpire.

answer the following question:

What is the last name of the man who claimed that the umpire that made a decision against the Victorian was correct? 

Barton