The American Journal of Science, Band 3;Band 203

acid akermanite alnoite analysis ant.-post atoms augite biotite birefringence Calculated canine carbonate Carex cesium cesium chloride Chamberlin chemical chloride chrysolite collected collophane color columbites composition compound contains crystals cusp density deposits depth described determined diameter diopside dissociation dustfall earth evidence fault fauna ferric forsterite fossil gehlenite genus Geol Geological glaciation glass grains heat Holotype homogeneous humboldtilite indices of refraction Inhomogeneous iron Jour Leidy length liquid loess lower M₁ Marsh material melilite Mesocyon miles mineral Miocene mixtures molars molecules monticellite Museum nearly Nebraska nephelite Niobrara River Oligocene olivine optical Ordovician original oxide perigynia phase pistillate plane Pliocene posterior premolars present pyroxene ramus rock SCI.-FIFTH SERIES shale skull solid solution species specific gravity specimen spikes structure surface TABLE teeth temperature tion trace trails transverse triple salt tubercle Upper Cambrian Walcott weight percent