118 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 



10 20 *0 4O SO 60 70 



Percentages. 



60 90 100 



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- 



