244 PROCEEDINGS OF THE AMERICAN ACADEMY. 



I. 0.3778 gram air-dried salt gave 0.1166 gram K 2 S0 4 . 



II. 0.6117 gram air-dried salt gave 0.1878 gram K 2 S0 4 . 



III. 0.3891 gram air-dried salt gave 0.1188 gram K 2 S0 4 . 



Baric Mucophenoxychlorate, Ba[C 4 H(OC 6 H 5 )C10 3 ] 2 . 



It was first attempted to prepare this salt by neutralizing a cold 

 aqueous solution of the acid with baric carbonate, and after filtration 

 allowing it to evaporate in vacuo over sulphuric acid. This method, 

 which gave satisfactory results with mucophenoxybromic acid,* proved 

 fruitless here, for the solution rapidly became acid, and deposited 

 crystals which, from their form and melting point, 91°, were evidently 

 the free acid. The salt was finally prepared by precipitation of an 

 aqueous solution of the pure potash salt, saturated at 50°, with a 

 similarly saturated solution of baric chloride; on chilling in a freezing 

 mixture, a crystalline precipitate appeared, whicli was sucked off, and 

 washed with small quantities of ice-cold water, until the washings 

 gave no precipitate with argentic nitrate. The salt crystallizes in 

 small anhydrous rhombic plates, which are extremely soluble, even 

 in the coldest water; and as its solution is so readily decomposed, no 

 attempt was made to recrystallize it for analysis. When pressed dry 

 between filter papers, it remained unchanged in the air, lost only a 

 trifling amount of weight over sulphuric acid, and but a trifle more 

 at 105°. 



I. 0.2982 gram substance gave 0.1161 gram BaS0 4 . 

 II. 0.2152 gram substance gave 0.0858 gram BaS0 4 . 



Calculated for Found. 



BatC^OCcII^ClOa].,. I. II. 



Barium 23.35 23.60 23.47 



No detailed study has yet been made of the decomposition mentioned 

 above ; it has, however, been noticed that there is no formation of 

 baric bromide, and that phenol and baric oxalate are set free. 



Argentic Mucophenoxychlorate, AgC 4 H(OC 6 H 5 )C10 3 . 



This salt is best prepared by adding a solution of the potassium salt 

 to an excess of moderately dilute argentic nitrate solution. There is 

 an immediate precipitate of white granular crystals, which is increased 



* These Proceedings, Vol. XIX. p. 264. 



