72 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 54 



Hence, with 30 = 48, KC1 = 74.593, ±.00086. 



The percentage of oxygen in sodium chlorate has been determined 

 only by Penny,' who used the same method which he applied to tlie 

 potassium salt. Four experiments gave the following results: 



45.060 

 45.075 

 45.080 

 45.067 



Mean, 45.0705, ± .0029 



Hence, NaCl = 54.500, ±.0048. 



For the composition of silver chlorate there are analyses by Marignac 

 and by Stas.' Marignac's series is as follows : 



.0041 



Corrected to a vacuum this becomes 74.917. 



The determinations by Stas are only two in number, giving the sub- 

 joined percentages of AgCl in AgClOg : 



74.919 



74.922 



Mean, 74.9205, ± .0010 



Combining this with Marignac's figure the general mean becomes 

 74.9203, ±.0010. Hence AgCl = 143.390, ±.0060. 



ANALYSES OF BROMATES AND lODATES. 



Accurate analyses of bromates and iodates, available for atomic weight 

 determinations, are few in number, and from a modern point of view, 

 not satisfactory. Potassium bromate was analyzed by Marignac,'' by 



1 Phil. Trans., 1839, p. 25. 

 ^ Oeuvres Completes, 1, 80. 



* Oeuvres Completes, 1, 635. 



* Oeuvres Completes, 1, 84. From the sum of his weights Marignac computes that KBrOj con- 

 tains 28.723 of oxygen. This calculation gives the fourth analjsis excossivo weight. 



