The American Journal of Science, Band 27;Band 177

acid activity amount angle appears base branched cent character close collection comparatively complete containing copper crystals curve deposits described determined diopside direction drift effect elements evidence experiments fact feet field figures formation front Geological given gives grams heat important included indicated interesting inversion iron known lake later lead lead dioxide length less light limits liquid lower material means measurements method miles mineral natural nearly noted observed obtained occur origin oxalate oxide plates portion position precipitate present probably quartz recent referred region relation represented river rocks separated shown silver similar sodium solution species specimen surface Survey Table taken temperature thorium tion University usually valley veins volume wing