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Composition of the mine waters ____________ _ Porosity of the gossan iron ore ___ _: __________ _ Distribution and character •of the gossan iron ore_ Distribution of the secondary copper ore-~-Texture of the secondary copper ore _________ _ Chemistry of alteration and enrichment ______ _ Segregation of iron ore and copper sulphide ore_ Silver and gold ___________________________ _ Solution of zinc ___________________________ _ T~nor of the ore beneath the chalcocite zone __ Enrichment below the chalcocite zone _______ _ Relation of chalcocitization to erosion _______ _ Comparisons with chalcocite zones elsewhere __ Summary of metasomatic processes_. ____________ _ Summary of genesis of the ores _________________ _ Future of the district_ _________________________ _ CHAPTER VI. Detailed descriptions of mines, by w. H.

The RAND CorporationRecently, there has been an increased interest in the possibility of learning during sleep. A critical review of the few scientific studies in this field to date lead to the conclusion that the evidence supporting claims of learning during actual sleep is inconclusive. The chief criticism against the existing studies is their failure to continuously determine the sleep state of Ss during the stimulus input period (16).After considerable exploratory work (IS), the present experiment was designed to study the effect of presenting material at different levels between wakefulness and deep sleep on the ability of Ss (a) to respond to it immediately, and (b) to recall it later upon awakening. It was hypothesized that learning during sleep was improbable.METHOD Subjects Twenty-one male experimental Ss were used. In order to facilitate the detection of gradual 1 The authors wish to acknowledge the valuable assistance of Louie W. Mason, Jr. and James L. Barnes in the analysis of the data in this study. Appreciation is expressed to the faculty and students of Santa Monica City College, to the Santa Monica Police Department, and to the volunteer Ss within The RAND Corporation for their cooperation throughout the project.