OF AETS AND SCIENCES : JANUARY 31, 1866. 95 



and contained three grammes of the oxide. Although the results of 

 the analysis indicate that the temperature of the air-bath was too low, 

 they also show, by comparison with the results obtained in operating 

 with strongly ignited oxide at about the same temperature of the air- 

 bath (see p. 92), that the brown oxide is decidedly preferable in re- 

 spect to the temperature required. This was also shown by the ap- 

 pearance of the oxide after combustion, — the newly formed chloride 

 being confined, in the case of the brown oxide, to a much shorter space. 

 Results of the Analysis. — 0.1640 gramme of chloride of amyl gave 

 0.3504 of carbonic dcid, 0.1562 of water, and 0.1884 of chloride of 

 silver. 



Calculated. Found. 



Carbon Cio 60 56.3910 58.268 



Hydrogen Hu 11 10.3383 10.582 



Chlorine CI 35.4 33.2707 28.360 . 



100. 97.210 



Analysis 4. — Used the same prejDaration of oxide of copper as in 

 Analysis 3, viz. the brown oxide. Temperature of the air-bath reached 

 170°. Shght carbonization occurred just at the close of the combus- 

 tion, from extending the heat backward too soon, under a wrong impres- 

 sion that the substance was all burnt. Were it not for this circum- 

 stance, it is believed that this would have been a good analysis, although 

 the temperature of the air-bath was kept so low. That a higher tem- 

 perature of the bath is desirable, however, is shown by the fact that 

 the chloride of copper appeared diffused over a space of 2|- inches. 

 The length of the column of mixed asbestos and oxide of copper was 

 only four inches in this experiment, containing but one gramme of the 

 oxide. 



Results of the Analysis. — 0.1568 gramme of chloride of amyl gave 

 0.3195 of carbonic acid, and 0.1522 of water. 



Analysis 5. — The oxide of copper employed was of the same prep- 

 aration as that of Analyses 3 and 4. The temperature of the air-bath, 

 however, was considerably higher, ranging from 240° to 247°. The 



