The latest mystery of the prize ring has been revealed by a reporter of the _Despatch_, who proves here conclusively that the so-called Jim Robinson, matched to fight Sailor Clancy in the big event at the Garden tonight, is no less a person than Jeremiah Benham, son of the late John Benham, Railroad and Steamship King. Last month it will be recalled that this paper sent a reporter up to Horsham Manor, the magnificent Benham estate in Greene County, where the so-called Jim Robinson was finishing his training at the invitation of Mr. Benham, who was supposed to take a warm sportsman's interest in the ring. Horsham Manor, one of the wonders of the State, is surrounded, as is well known, by a wall of solid masonry, and much secrecy was observed in the training of the so-called Robinson, all visitors being denied admittance at the lodge gates. The reporter, however, managed to gain admittance and reached Mr. Benham's gymnasium, a palatial affair, fully equipped with all the latest paraphernalia, where the so-called Robinson was boxing with one of his partners. But a person who represented himself to be Mr. Benham immediately gave orders to have the reporter shown out of the grounds. The life of the younger Benham has been shrouded in mystery, but this morning after some difficulty the reporter succeeded in finding the photographer who made the picture of Robinson printed herewith, who at last confessed that it was faked. Further investigation among members of an uptown club revealed the fact that Jeremiah Benham has just passed his twenty-first year and could therefore not be the slender, rather crusty, sandy-haired gentleman impersonating the owner of Horsham Manor, who was at least thirty-five. "Slender--rather crusty!" muttered Ballard. "You! D--n the fellow!" In order to verify the suspicion [I read on], the _Despatch_ reporter went to the office of the New York and Southwestern Railroad and obtained without difficulty from several sources a description of the person of Mr. Benham, which coincides in all particulars with the so-called Jim Robinson, whom the reporter saw at work at Horsham Manor. There is no Jim Robinson, except in name. The opponent of Sailor Clancy in tonight's fight is no less a person than young Jerry Benham, multi-millionaire and sportsman. It is a matter of regret, since Mr. Benham chose, for personal reasons, to hide his identity under another name, that the _Despatch_ could not keep the matter secret, but the _Despatch_ is in the business of supplying news to its patrons, news not presented in other journals, and so important an item as this, of course, could not be suppressed. The murder was out. We searched the other papers. Nothing.