OP ARTS AND SCIExNCES. 179 



oil cooling the aqueous solution, in globular aggregations of fine 

 needles. The air-dried salt contained one molecule of water and 

 slowly effloresced over sulphuric acid. 



I. 1.6850 grm. of the air-dried salt lost at 120° 0.0753 grm. H,0. 

 11. 1.7346 grm. of the air-dried salt lost at 112° 0.0784 grm. H^O. 



Calculated for Found. 



KCjBraOa . 11,0. I. II. 



H„0 4.44 ' 4.47 4.52 



I. 0.6838 grm. of the anhydrous salt gave on ignition with H^SO^j 

 0.1522 grm. K^SO,. 

 II. 0.5826 grm. of the anhydrous salt gave on ignition with HgSO^ 

 0.1819 grm. K.,SO,. 



Calculated for Found. 



KOsBr^Oj. I. II. 



K 10.10 10.09 10.16 



Ethyl Tribrompyromucate, (C2H.)C5l3r303. — The ethyl ether we have 

 prepared by warming the silver salt of the acid with ethyl iodide, and 

 also by heating an alcoholic solution of the acid with concentrated 

 sulphuric acid. In the latter case we found it convenient to use two 

 parts of absolute alcohol and one part of concentrated sulphuric acid 

 to one part of the acid. After heating for several hours at 100°, we 

 precipitated the ether by the addition of water, washed it with a dilute 

 solution of sodic carbonate, and recrystallized it trora alcohol. It 

 formed clear rectangular prisms, which melted at 104°, and have little 

 or no odor at ordinary temperatures. It is readily soluble in ether, 

 chloroform, benzol, or carbonic disulphide, somewhat more sparingly 

 soluble in ligroin. It is quite sparingly soluble even in boiling alco- 

 hol. The material used in Analysis II. was made from the silver salt. 



I. 0.1785 grm. substance gave 0.2677 grm. AgBr. 

 II. 0.1526 grm. substance gave 0.2284 grm. AgBr. 



Br 



Trihrompyromucamide, C^)irf)J:iiU„. — Although ethyl tribrompy- 

 romucate is but slowly attacked by concentrated aqueous ammonia at 

 ordinary temperatures, it is readily decomposed at 100° in sealed tube 

 with the formation of trihrompyromucamide. The resulting product 

 was purified by recrystallization from alcohol, and formed then fine 



