CARBON. , 51 



Third.^-The method of Stas, by the combustion of carbon 

 monoxide. 



The first of these methods, which is also the least accu- 

 rate, was employed by Liebig and Redtenbacher* in 1S40. 

 They worked with the acetate, tartrate, racemate, and malate 

 of silver, making five ignitions of each salt, and determining 

 the percentage of metal. From one to nine grammes of 

 material were used in each experiment. 



In the acetate the following percentages of silver were 

 found : 



64.615 

 64.624 

 64.623 

 64.614 

 64.610 



Mean, 64.6172, =fc .0018 



After ap|)lying corrections for weighing in air this mean 

 becomes 64.6065. 

 In the tartrate the silver came out as follows : 



59-297 

 59-299 

 59-287 

 59-293 

 59-293 



Mean, 59.2938, dr .0014 

 Or, reduced to a vacuum, 59.2806 



In the racemate we have : 



59.290 

 59.292 

 59.287 

 59-283 

 59.284 



Mean, 59.2872, =b .0012 

 Or, corrected, 59.2769 



* j\nn. Cham. Pharm., 38, 137. Mem. Chem. Soc, i, 9. Phil. Mag., (3,) 

 19, 210. 



