W. Gibbs— Complex Inorganic Acids. 63 
sium salt, and I consider this—provisionally at least—as deter- 
ici id. This is important as 
showing that it is not phosphoric oxide, P,O,, which alone is 
saturated. Debray considered the corresponding phospho-molybdic 
ith the newer atomic weights it 
would of course be regarded as 12-basic, if his view were correct. 
He describes however a 7-atom silver salt which I should write 
20Mo0;.P,0;.7O0Ag, . OH, + 24 aq. 
and which is clearly the analogue of my potash salt above men- 
excepting possibly that of the very acid sodium salt which heads 
the list. The analyses of these salts as well as of the platinum 
The n 
tungstic acid and its salts are easily obtained, and I have more or 
acids, I prove that there are also niobio-tungstic and tan- 
talo-tungstic acids, an experiment will soon decide this point 
But generalization is also possible in other n 
Well defined. You see that. in this way the number of new acids 
is Very great and that I have a heavy task before me. It is of 
e0 
me phospho-tungstates, &c., will be more easily seen, as we shall 
‘ve for the sodium salts for instance, 
‘ 20WO, . Pt,O, . 80Na,, and 20 WO,.P,0; . 80Na,, 
meantime I have as yet seen no satisfactory reason for the change. 
rv m disposed to think that the well known and very singular 
Shonty tates and molybdates, 30Na,.7WO, and 30Na,.7MoO,, 
ould be multiplied by 3 and written 
