236 PROCEEDINGS OF THE AMElilCAN ACADEMY 



either with or without chlorhydiic acid. Argentic nitrate gave a 

 turbid white solution ; on boiling, silver was reduced. Mercurous 

 nitrate gave a white flocky precipitate, which on boiling became yel- 

 low, and finally dirty greenish yellow, without reduction of mercury. 

 Baric chloride gave a white precipitate of indistinct feathery crystals. 

 When heated in a porcelain crucible the salt became blue, and finally 

 white, giving off a sharp acid smell. The residue dissolved in water, 

 in part at least, forming a strongly acid solution. Of this salt 



( 1.2295 gr. lost on ignition 0.0340 gr. ^ 2.76 % water and hydrogen. 



1 1.2295 gr. gave 1.1172 gr. WO3 + PA = 90.84% 



0.7272 gr. lost on ignition with W04Na2 0.0203 gr. = 2.79 % 

 1.5110 gr. gave 0.1921 gr. P^Mg^ = 7.57% POgHg 



The analyses lead to the formula 



18 WO3 . 6 {H, . PO . OH} 4 K^O + 7 aq, 

 which requires : — 



90.28 



5074 100.00 100.15 



In the analysis the hypophosphorous acid was determined by oxida- 

 tion with bromine in an alkaline solution and precipitation with 

 magnesia-mixture. The formula given may be written, with equal 

 probability, 



• 18 WO3 . 6 {H2 . PO . OK} Kp . 3 HP + 7 aq, 



since the assignment of the fixed base is purely arbitrary ; other 

 arrangements are also possible. I am disposed to regard the salt as 

 acid, with the formula 



2 (6 WO3 . 2 {FI^ . PO . OH} 2 K,,0) + 



6 WO3 .'2 {H2 . PO . OH} 2 H^O + 5 aq, 



so that the type of the corresponding acid, setting aside the question 

 of basicity, will be 



6 WO3 . 2 |H, . PO . OH} 2 H^O. 



