period of retention. It has been demon niticant. No important gravel deposits having suitable water others in its construction and in the relative sizes of the strated by experiments with fired gunpowder that in a very supply are known to exist. parts composing it. As the current which traverses… … deep mine gold in Idaho is as 60 to 40. The census them much smaller. These preliminaries stated, I NEW MAGNETIC EXPLODES. examination was made too early to include the shall now pass on to a description of the two developments in the Wood River country and the models that I have had constructed in…