North in phases of the statistical investigations of the arrestment errors, of James L. Webb in the investigation of the rider bar, and of Seederer-Kohlbusch, Inc., Englewood, N. J., in making some of the experimental alterations upon the Kuhlmann balance.
Cuprous oxide is readily soluble in cold, dilute aqueous hydrochloric acid, cupric oxide is slightly soluble, and metallic copper is very slightly soluble.
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