... .MARAKEIT JJMAL I). CORN EXCtANaOE, Monday, Alay 15, I80d. We had cowfiderable arrivals of Wheat this morning, and norwitliflanding the prevalingdecline along the vreek Fine feinples to-day fetched iearly fall Monday's prices. -Barley bas fallen Ss. and 4s. per Quarter; and Milt, of courfe, is become heavy, and lower in proportion.- White and Grey Peale are ?? upon the deeline, as are likewife ...