Show OK THE slopes of the volcioo of San Salvador in Central America exists a curious intermittent spring It is known to the natives of the country as the Rio Huido or fugitive river During seven consecutive years sufficient water flows from it to form a veritable river when at a fixed time the water diaappearr and the river bed becomes dry and dusty At the end of another period of seven yeara the flow again commences A period of flow extended from 1866 to 1873 and was succeeded by a period ofdryness from 1873 to 1880 In January of this year the water reappeared re-appeared Science ia not unacquainted unac-quainted with such phenomena but the length and regularity of the period of intermittence in this case are remarkable |