IRON. lo.) 



it to reduction in a stream of hydrogen. Two sets of results 

 were obtained with two different samples of ferrous oxalate, 

 prepared by two different methods. For present purposes^ 

 however, it is not necessary to discuss these sets separately. 

 The percentages of iron in Fq.JJ^ come out as follows : 



70.013 ^ 

 69.962 



69-979 '■A. 

 70.030 I 

 69.977 J 

 70.044 ] 

 70.015 !- B. 

 70.055 



Mean, 70.0094, zfc .ooSo 



In 1850 Maumene's* results appeared. He dissolved pure 

 iron wire in aqua regia, precipitated with ammonia, filtered 

 off the precipitate, washed thoroughly, ignited, and weighed, 

 after the usual methods of c|uantitative analysis. The per- 

 centages of Fe in FejOg are given in the third column : 



1.482 grm. Fe gave 2. 117 gnn. Fe^Og. 70.005 percent. 



[.452 " 2.074 " 70.010 



1.3585 " I-94I " 69.990 



1.420 " 2.0285 " 70.002 



[.492 " 2.1315 " 69.998 



[.554 " 2.220 " 70.000 



Mean, 70.0008, ± .0019 



Two more results, obtained by Rivotf through the reduc- 

 tion of ferric oxide in hydrogen, remain to be noticed. The 



percentages are : 



69.31 

 69-35 



Mean, 69.33, =t -Oij 



We have thus before us six series of results, which we 

 mav now combine. 



*Compt. Rend., Oct. 17, 1850. 



t Ann. Chem. Pharm., 78, 214. 1851. 



