OP ARTS AND SCIENCES. 131 



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 phosphoric 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 0.1627 gr. H. 2 + NH 3 = 11.58% 

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



1 0.7705 gr. gave 0.1243 gr. P. 2 O n U 2 = 3.21% P 2 5 



0.9629 gr. " 0.1430 gr. NH 4 C1 = 7.17% (NH 4 ) 2 



The analyses correspond with the formula 



16 W0 3 . P 2 5 . 6 (Nig 2 -f 10 aq, 

 which requires : — 



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

 I have obtained is a sodium salt with the empirical formula 



14 W0 3 . 2 PA • 5 Na 2 -f 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 5 H n PMi + 13 H 2 0. 



* Berichte der Deutschen Chemischen Gesellschaft, V. 801. 



