... I _ I THE EOYFTUI CHALLBUeGI TO THE JOCKEY CLUs.-Au English sporting gentleman has taken the trouble and incurred the expense of measuring accurately the piece of ground laid out for the race expected to come off between his Higbness's horses and those proposed as competitors by the English Jockey Club. It is on the desert, within a few miles of Cairo, and consists of heavy sand from five to ...