[Duodenum]

Dempsey almost certainly watched Langford fight during Sam's visit to Denver, in the summer and fall of 1915, against Jack Thompson, Jim Johnson, and Sam McVey. Since Langford went 20 rounds with McVea, and 15 more with Johnson, Jack would have seen a great deal of him. (My old copy of the 1957 Ring Record Book indicates that while Dempsey was also active in Colorado at the time, he had no matches during the weeks Langford was boxing in Denver, so it's reasonable to assume that's when he saw Langford.)