256 PEOCEEDINGS OF THE AMERICAN ACADEMY 



with a pale orange flocky or indistinctly crystalline substance, with an 

 orange-red supernatant liquid. Potassic bromide in large excess gives 

 an orange crystalline, and argentic nitrate a cinnamon-colored not 

 distinctly crystalline precipitate. Mercurous nitrate and plumbic 

 acetate give orange precipitates. A solution of chloride of trimethyl- 

 ammouium, ^(CPygHCl, gives an orange precipitate in the concen- 

 trated solution, soluble in boiling water, and crystallizing in beautiful 

 small granular crystals, which are orange with an aurora-red tint. 

 The crystals of the ruby-red salt became duller upon the surfaces 

 when dried on woollen paper, but did not distinctly effloresce. Of 

 this salt, — 



1.0686 gr. lost on ignition with WO^Na^ 0.2833 gr. = 26.51^ NHg 



and H^O 

 1.3051 gr. gave 0.2245 gr. NII^Cl t= 8.36% (NH,),0 

 1.1020 gr. " 0.3253 gr. VoO^ =29.51% 

 1.1113 gr. " 0.0598 gr. F.jO^Mgo = 3.44% P2O5 



The analyses lead to the formula, 



14 M0O3 . PA . 8 V2O5 . 8 (NHJP + 50 aq. 



4938 100.00 



If we assume that in this salt vanadic pentoxide stands in a relation 

 to phosphoric oxide exactly analogous to that of molybdic teroxide, 

 the compound will be of the same type as the phospho-molybdate 

 already described, 



22 MoO, . P,0, . X R,0, 



since we may write y.J^o ^^ '^^ '^^^ rational formula were V^O., . O.3. 



In some preparations of this salt I observed the formation of two 

 other salts in relatively small quantity. One of these formed pale 

 orange-colored needles ; the other, glimmering scales but slightly solu- 

 ble in hot water. 



