OF ARTS AND SCIENCES. 207 



I. 15.373 grm. of a solution saturated at 20° gave 0.0189 grm. 

 CaS0 4 . 

 II. 13.879 grin, of a solution saturated at 20° gave 0.0170 grm. 

 CaS0 4 . 



The aqueous solution saturated at 20° therefore contained the 

 following percentages of the anhydrous salt: — 



I. II. 



0.41 0.10 



Argentic Brommethylpyromucate, AgC 6 H 4 Br0 3 . — The silver salt 

 crystallizes from hot water in spherical aggregations of dendritic 

 needles. 



0.0956 grm. salt gave 0.0574 grm. AgBr 



Calculated for AgC G H 4 Br0 3 . Found. 



Ag 34.61 34.48 



Potassic Brommethylpyromucate, KC 6 H 4 Br0 3 . — This salt is 

 very readily soluble even in cold water, and crystallizes on slow 

 evaporation of its aqueous solution in small anhydrous needles. 



0.2789 grm. salt gave 0.0993 grm. K 2 S0 4 . 



Calculated for KC c H 4 Br0 3 . Found. 



K 16.08 15.99 



Action of Bromine and Water. 



The whole behavior of the brommethylpyromucic acid showed 

 conclusively that its bromine atom was situated in the furfuran 

 ring. Although the bromacetacrylic acids had not yet been made, 

 one of which would doubtless be formed by the oxidation of this 

 brommethylpyromucic acid, and we therefore could not hope to de- 

 termine whether the bromine was in the /3 or in the y position, 

 we nevertheless thought it best to investigate the products of oxi- 

 dation. Brommethylpyromucic acid was suspended in thirty times 

 its weight of water, and somewhat more than two molecules of 

 bromine then slowly passed in by means of a current of air. The 

 acid was readily carried into solution, and at the same time a small 

 amount of an insoluble substance was formed. The filtered solu- 

 tion was extracted with ether, and the ethereal extract dried with 

 calcic chloride. The viscous residue which was left on the distilla- 

 tion of the ether gradually solidified on standing over sulphuric 

 acid in vacuo. This body proved to be an acid, containing bromine, 



