76 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



28.407 grains Ag gave 37.737 AgCl. 132.844 



41.917 " 55.678 " 132.829 



40.006 " 53.143 " 132.837 



30.922 " 41.070 " 132.818 



Mean, 132.832, ± .0038 



The same general metliod of dissolving silver in nitric acid, precipi- 

 tating, evaporating, and fusing without transfer of material was also 

 adopted by Penny.' His results for 100 parts of silver are as follows, in 



parts of chloride : 



132.836 

 132.840 

 132.830 

 132.840 

 132.840 

 132.830 

 132.838 



Mean, 132.8363, ± .0012 



In 1842 Marignac' found that 100 parts of silver fonned 132.74 of 

 chloride, but gave no available details. Later/ in another series of de- 

 terminations, he was more explicit. Silver was dissolved in nitric acid, 

 and precipitated by hydrochloric acid. The precipitate was washed several 

 times with boiling water, by decantation, and the chloride was finally 

 dried and fused in the same flask in which it had been formed. The 

 figures are as follows : 



Ratio. 



132.844 

 132.843 

 132.825 

 132.839 

 132.844 



Mean, 132.839, ± .0024 



Corrected for weighing in air the mean becomes 132.854. 



The above series all represent the synthesis of silver chloride. Mau- 

 mene * made analyses of the compound, reducing it to metal in a current 

 of hydrogen. His experiments make 100 parts of silver equivalent to 

 chloride : 



iPhil. Trans., 1839, 28. 



2 Ann. Chem. Pharm., U, 21. 



" Oeuvres Compl&tes, 1, 79. 



* Ann. Chim. Phys. (3), 18, 49. 1846. 



