OF ARTS AND SCIENCES. 103 



7398 100.00 



Of course, in thi.s salt, as in the arsenoso-phospho-tungstates de- 

 scribed, arsenic may be supposed to be in the form of {H . AsO . (OH)^} 

 eitlier wliolly or partially. 



Classes of antimonoso - arseuio - tungstates, antimonoso - antimonio- 

 tuogstates, and arsenoso-antimonio-tungstates, appear also to exist and 

 to be formed by processes exactly analogous to those described in the 

 cases of the compounds containing two oxides respectively of the forms 

 R.^Oo and R'oO., united with tungstic oxide. 



ANTIMONOSO-PIiOSPHO-TUNGSTATES. 



These salts are formed under the same conditions as the correspond- 

 ing arsenoso-phospho-tungstates, and the methods of analysis to be 

 emploj^ed are the same. 



22 : 6 : 5 : 12 Potassic Anliinonoso-phospho-tungstate. — When a 

 solution of potassic phosphate is poured into a hot solution of sodic 

 aiitimonoso-tuugstate as obtained by dissolving SbOCl in 10 : 4 sodic 

 tungstate, a very pale yellow highly crystalline salt is at once formed. 

 This is nearly insoluble in both hot and cold water. The portion 

 analyzed was filtered off, washed upon the filter-pump with cold 

 water, drained, and dried upon woollen paper. The salt, like many 

 others which I have described, could not be recrystallized, but I 

 give the results of the analyses for what they may prove to be 

 worth. They certainly, I think, establish the existence of the series. 

 In this salt, 



( 0.7776 gr. gave 0.6142 gr. oxides = 78.99% 



( 0.7776 gr. " 0.4763 gr. PtClJv, =11.90% 



1.0323 gr. " with iodine 0.1594 gr. Sb.Og = 15.44% 

 0.9716 gr. " " 0.1509 gr. '' =15.53% 



1.2300 gr. " 0.1805 gr. P,,0,Mg,, = 9.20% P^O^ 



1.2430 gr. " 0.1821 gr. " '• " = 9.37% '"' 



