NITKOGEN. 91 



The larger the amount of titanium present, the lower will 

 the atomic weight be ; Marignac therefore takes the highest 

 value. {Liebifs Ann., S. 4, 334, 288, 338; Bibl. Univ., 

 Arch, des Sciences, 28, 1865, 25, 1866.) 



NITROGEN. 



Regnault has determined the specific gravity of nitrogen. 

 It indicates an atomic weight slightly above 14. {Gmelln- 

 Kraut, I. c.) 



BiOT and Arago ; Wollaston : 14-.03 (0 = 16) ; 

 87.7 (0 = 100). 



Biot and Arago found the specific gravities of N and H 

 0.96913 and 0.07321. If H = 13.27 the value follows. 

 [This very accurate value is of course the result of two 

 compensating errors.] [Phil. Trans., 104-, 1814, 20.) 



J. J. Berzelius ; U.163 (0 = 16) ; 88.518 (O =100). 



Calculated from the specific gravity as determined by 

 Berzelius and Dulong, compared with that of oxygen. By 

 decomposing the nitrate of lead by heat, Berzelius also 

 found I^ = 88.61 for Pb = 1294.498. {Poqgend. Ann., 8, 

 1826, 14.) 



E. Turner: 14.15 (0 = 16). 



Determined by experiments on the nitrates of lead, silver, 

 and barium, which were precipitated with sulphuric and 

 hydrochloric acids, and gave respectively N = 14.201 ; 

 14.09; 14.17; if Pb = 103.6; Ba = 68.7 ; 01 = 35.42; S 

 = 16.085 ; the weighings being reduced to vacuum. The 

 salts were purified by recrystallization. Turner recom- 

 mends more direct methods. {Phil. Trans., 123, 1833, 537.) 



T. Thomson : i^ (O = 16). 



From the hypothesis that air is a compound containing 

 four parts of N and one part oxygen, and from the average 

 of various selected determinations of the specific gravity of 

 oxygen, Thomson concludes the specific gravity of oxygen 

 is 1.1111, and that of N 0.9722. These numbers stand 



