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Some Physical Properties of Nitric Acid Solutions.
discussed in full; in the former, those of analysis, unavoidable
in this case, temperature, errors of filling pyknometers both with
acid and water; in the latter, those of micrometer screws, divided
circle, parallelism of quartz plates, as also the several effects likely
to be produced by the various substances with which the acid
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solutions of necessity came into contact. The results obtained by both methods are given in a series of tables and compared with those calculated from various equations for straight lines. These show that the physical properties display well-marked alterations at definite points in a word, such properties are discontinuous. Further, such points correspond very approximately to the concen-
