Q6 ■ SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



The several values for chlorine, as derived from hydrochloric acid and 

 also from the analyses of nitrosyl chloride, as cited in the next section 

 of this work, now combine thus : 



By syntheses of HCl CI = 35.4652, ± .0005 



Guye and Ter Gazarian 35.4615, ± .0015 



Gray and Burt, revised 35.4569, ± .0007 



Scheuer 35.4528, ± .0007 



From NOCl, Guye and Fluss 35.4680, ± .0010 



General mean CI = 35.4630, ± .00032 



This varies from the value adopted in the previous discussion, Cl = 

 35.4647, by one part in 21,000. Its introduction into the final reduction 

 of the fundamental atomic weights would change the latter inappreciably. 



ANALYSES OF NITROSYL CHLORIDE. 



The analyses of nitrosyl chloride, NO CI, by Guye and Fluss," are of 

 special interest, because they give direct ratios between the three com- 

 ponent elements. The carefully purified chloride was first weighed, and 

 then distilled over heated silver, which absorbed the chlorine. The 

 weight of the latter was given by the gain in weight of the silver. It 

 was next passed over heated copper, which retained oxygen, and finally 

 over metallic calcium to fix the nitrogen. The sum of the three com- 

 ponents was generally a little less than that of the nitrosyl chloride, but 

 -whether the loss represents undetermined impurity, or failure to collect 

 all the products of decomposition, seems to be uncertain. The weights 

 obtained were as follows : 



NOGl. CI. 0. N. Loss. 



.5341 .2893 .1305 .1142 .0001 



.4284 .2319 .1046 .0916 .0003 



.7995 .4331 .1954 ,1710 .0000 



.5639 .3048 .1375 .1204 .0012 



.5121 .2773 .1251 .1095 .0002 



From these figures, with = 16, the atomic weights of N and CI are 



directly calculable, by comparison with = 16. In a third column I also 

 give the value of the ratio CI: N : : 100 : a:, computed from columns 2 

 and 4. 



N. Gl. Cl:N. 



14.001 35.470 39.475 

 14.011 35.472 39.500 



14.002 35.464 39.483 

 14.010 35.468 39,501 

 14.005 35,466 39,488 



Mean, 14.006, ± .0017 35.468, ± .0010 39.489, ± .0033 



' Journ. Chim. Phys., 6, 732. 190S. 



