OF ARTS AND SCIEN'CES. 143 



yellowish tinge after several distillations, we distilled it for analysis 

 under diminished pressure, and found it to boil at 133-134° under 

 a pressure of 31 mm. On cooling, the ether crystallized in clear 

 prisms with bevelled ends. The melting-point of the solidified ether 

 was found to be 17°, and when the liquid ether was cooled to 13°, and 

 a crystal of the solid ether introduced, the thermometer rose to 17°. 

 The specific gravity of the ether at 20° referred to water at the same 

 temperature we found to be 1.528. 



Analyses I. and II. were made with substance prepared from the 

 silver salt; III. and IV. from substance made with sulphuric acid. 



I. 0.2171 grm. substance gave 0.1875 grm. AgBr. 



II. 0.1 61G (jrm. substance i^ave 0.1380 ffrm. AgBr. 



III. 0.8571 grm. substance gave 0.3042 grm. AgBr. 



IV. 0.3080 arm. substance orave 0.2623 irrm. AirBr. 



Br 



h-Monohrompyromucamide, CjII.^BrO.NIIo. — Concentrated aque- 

 ous ammonia acts but slowly upon the ether in the cold, and several 

 days are necessary to complete the reaction. At 100° in a sealed tube 

 the decomposition is perfect in a few hours, but the yield of the amide 

 is apparently not so satisfactory. The product of the reaction when 

 recrystallized from boiling water forms long shining needles which 

 melt at 144-145°. They are sparingly soluble in cold water, readily 

 in hot, readily soluble in alcohol, ether, chloroform, or in hot benzol, 

 sparingly soluble in cold benzol or carbonic disulphide. For analysis 

 the substance was recrystallized from boiling water and dried over 

 sulphuric acid. 



0.7761 grm. substance gave 50.6 c.c. of moist nitrogen at 20°, and 

 under a pressure of 747 mm. 



Calculated fir C.-II,BrO.,NII,. Found. 



N 7.37 ' ' 7.46 



^-Monohrompyromiicic tetrnbromide. — When exposed to an atmos- 

 phere of bromine, the 8-monobrompyromucic acid takes up four atoms 

 of bromine. The addition product is readily soluble in alcoliol or 

 ether, is decomposed by water, but may be recrystallized from glacial 

 aceiic acid. It forms fine needles which decompose without melting 

 at 173°. 



0.1948 grm. substance gave 0.3594 grm. AgBr. 



Calculated for CjIljKrjOa. Found. 



Br 78.29 78.52 



