The Magnetic Cactus.The Tribune is in receipt of additional particulars in regard to tho wonderful Magnetic Cactus recently discovered in the Ripsey country. The following letter will fully explain itself:Dagger Will,Near Ripsey Mine,Feb. 9th, 1899. Editor Florence Tribune:The tnognelic cactus you wrote about in last week's TRIBUNE It a species of the Giant Sahuara. It is found in many places between Casa Grande and Florence, between Flor-euce and Mesa and between Florence aud Riverside.There is a belt of the earth wllhin a radius of fifty miles of Florence that la very magnetic, no doubt caused by vaat beds of copper or »oiuo other magnetic mineral that underlies it all, and this species of Cactus from Its fibrous nature acts like a telegraph instrument to receive and discharge the earth's vast surplus of magnetism, uot required by the moon's aud sun's magnetic attraction.