32 ATOMIC WEIGHT DETERMINATIONS. 



malate and argentic nitrate. The salt thus obtained was 

 dissolved in mtric acid, and reprecipitated with ammonia 

 added drop by drop, not to complete neutralization, washed 

 and dried. {Lkbir/s AnnaL, 88, 1841, 139.) 



A. Strecker recalculated Liebig and Redtenbacher's 

 analyses given above, independently of the atomic weight 

 of silver, from the difference in their atomic composition, 

 employing the method of least squares. He found C = 

 75.415 ± 0.061, or 12.066 ± 0.01. In the sanie way, and 

 from the same analyses he calculated the atomic weight of 

 silver at 1348.79, or 107.9032. [The close coincidence be- 

 tween this result and Stas', is certainly worthy of remark,] 

 {Liebig' s Annal, 59, 1846, 280.) 



Marignac repeated Liebig and Redtenbacher's experi- 

 ments and got almost the same results, but, by varying the 

 method so as to preclude loss by spirting, different ones. 

 {Liebig' s AnnaL, 59, 1846, 287.) 



Stas had the same experience as Marignac, and also 

 ascribes Liebig and Redtenbacher's high results to loss by 

 spirting. {Bulletin de VAcad. Roy. des Sciences de Belgique, 

 16, 1849, 9.) 



C. Marignac : 11.986 (0 = 16). 



Determined by three analyses of the acetate of silver. The 

 salt was decomposed by heat in a tube in such a way that 

 the products of decomposition were forced to pass through 

 porous silver, and loss by spirting was impossible. 100 parts 

 of the salt were found to contain a mean of 64.664 silver, with 

 an extreme difference of 0.005 in vacuo. [If Ag := 107.93, 

 these figures give the above value.] Marignac regards the 

 analysis as a confirmation of Dumas and Stas' determina- 

 tion. The acetate was prepared by solution of argentic 

 carbonate in acetic acid and successive recrystallizations. 

 {Liebifs Annul, 59, 1846, 287; Bibl. Univ., Arch, des 

 Sciences, 1. 1846.) 



Strecker believes that the silver in Marignac's determina- 

 tion must have retained carbon. {Ibid. 284.) 



F. VON Wrede: 12.019 (0 = 16); 75.12 (0=100). 



Von Wrede determined the specific gravity of carbon di- 

 oxide, taking into consideration its variation from the law 



of Marriotte. He found it equal to 1.52037 — ytt^T"^'' 



He also found the specific gravity of oxygen 1.1052 and 



