CONTENTS. 



ERUPTIVE ROCKS. 



Page. 



TABLE I. Complete analyses 589 



II. Silica and alkali determinations 590 



III. Lead, zinc, cobalt, and barium dctermiuatious 591 



IV. Gold and silver determinations 594 



LIMESTONES. 



TABLE V. Complete analyses 596 



VI. Lime, magnesia, and chlorine determinations 598 



VII. Serpentine and amphibole analyses 598 



ORES AND VEIN MATERIALS. 



TABLE VIII. Sand carbonates 599 



IX. Chloro-bromo-iodides 600 



X. Various ores, vein materials, and country rocks 602 



XI. Alteration products of porphyry 603 



XII. Alteration products of galena and pyrite 60G 



XIII. Miscellaneous alteration products 607 



XIV. Assays of ores, vein material, and country rocks for silver and gold 608 



587 



