Hi Kevin, I too would love to see any other photos taken by Edgar Horne, either on that day or any other. However - and at the risk of sounding unduly pessimistic - I'm pretty certain that Mackail was referring to the dozen other photos of Barrie and Michael, evidently taken on that same day to judge from Michael's clothes and shoes, which are the same in all the photos. If you go to the database and search for "1905", they're all there, including the one I used in my book (and I think also used by Audrey Lucas in the book about her father, E V Lucas - also possibly in "Dear Turley" = Charles Turley Smith). Happy hunting!