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Hexamminecobalt(II1) sa.lts may be prepared by any of three methods that depend on oxidation of cobalt(I1) ion * Procedures for preparing most of these salts were originally submitted by Dr. McReynolds, who was impressed by the simplicity of Dr. Bjerrum's method. Shortly after the manuscript for Vol. I1 had been sent to the publisher, similar procedures for three of these salts were submitted by Dr. Bjerrum. Inasmuch as the method was developed by Dr. Bjerrum and war conditions prevented his submitting the procedures a t an earlier date, the editors have taken the liberty of combining the two sets of directions and presenting them as a joint effort of the two men.

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