OF ARTS AND SCIENCES. 131 



which requires : — 



Calc'd. 



I6WO3 3712 80.53 80.48 



P.O^ 142 3.08 2.'J8 



4 K,0 377.6 8.19 8.53 (diff.) 



21 Ilf> 378 8.20 8.01 



4609.6 100.00 



16:6 Ammonium Salt. — This beautiful salt was prepared by 

 adding a solution of amnionic chloride to the sirupy liquid obtained 

 by boiling 12:5 sodic tungstate with half its weight of a strong 

 solution of pure phos{)horic acid. After standing twelve hours an 

 abundant precipitate of the ammonium salt was formed. This precipi- 

 tate, after being well drained and twice recrystallized, gave very fine 

 flat prismatic crystals. It is the best-defined ammonium salt which 

 I have obtained. The salt is readily soluble in hot water, and crystal- 

 lizes as the solution cools. Of this salt, — 



1.4108 gr. lost on ignition 0.1G27 gr. YL.fi + NH3 = 11.58% 

 C 0.7705 gr. " " 0.0886 gr. " = 11.49% 



(0.7705 gr. gave 0.1243 gr. P^OnUo = 3.21% P.^ 



0.9629 gr. " 0.1430 gr. NH^Cl = 7.17% (NHil.^O 



The analyses correspond with the formula 



16 WO3 . Vf>, . 6 (NII,)20 + 10 aq, 

 which requires : — 



4346 100.00 100.00 



Fourteen to Two Series. — The only compound of this series which 

 I have obtained is a sodium salt with the empirical formula 



14 WO3 . 2 P2O5 . 5 Nap + 42 aq. 



I regard this as a double salt, or perhaps as a compound of an 8-atom 

 and a 6-atom salt. 



14 : 5 Sodium Salt. — In the communication already referred to,* 

 Scheibler described briefly a sodium salt to which he gave provision- 

 ally the formula 



Na,H„P,Wp,i + 13 H,0. 



* Beriohte der Deutschen Chemischen Gesellschaf t, V. 801. 



