Products of the Oxidation of Wool. 361 



mass insoluble in ether and water, but soluble in caustic 

 potash. On ignition a small quantity of charcoal difficult of 

 combustion remains. The proportion of such charcoal yielded 

 by the acid dry at 140° G. is about one sixth of the weight of 

 the acid. On continuing the application of heat this charcoal 

 gradually burns away and no residue is left. 



As will be seen presently, most of the salts of cyano-pro- 

 pionic acid are soluble in water, the only exceptions we have 

 met with being the salts of silver, lead, and peroxide of iron. 

 Solutions of cyano-propionates give no precipitate with salts 

 of alumina, copper, and peroxide of mercury. Those cyano- 

 propionates which are soluble in water are insoluble or very 

 sparingly soluble in strong alcohol. Certain salts, as, for 

 instance, those of lime, baryta, and magnesia, are very 

 sparingly soluble even in 40-per-cent. alcohol. 



As a rule, the salts of this acid exist in combination with 

 water. The only salt which we have found to be nearly an- 

 hydrous is the silver salt. So far as we have ascertained, de- 

 composition sets in before the hydrated salts give up the last 

 portions of water. 



Cyano-propionate of Baryta, (C 4 H 4 N Ba0 2 ) 2 3H 2 0, is ob- 

 tained in a state of purity, as has already been described, by 

 precipitating its strong aqueous solution by means of an equal 

 volume of 84-per-cent. alcohol. The precipitate is a powder 

 almost absolutely white, which may be washed with 40-per- 

 cent, alcohol, in which it is very sparingly soluble. It 

 should be afterwards pressed between folds of bibulous paper 

 and dried in the water-bath. After prolonged drying at 

 100° C. it has the above formula, and has furnished the fol- 

 lowing results on analysis : — 



I. 0*923 grm., burnt with chromate of lead, copper-turnings 

 being used in front of the combustion-tube, gave 0*290 grm. 

 of water and 0*842 grm. of carbonic acid. 



II. 1*471 grm. gave 0*907 grm. of sulphate of baryta. 



III. 0*259 grm. gave 0*157 grm. of sulphate of baryta. 



IV. 0*958 grm. gave 0*587 grm. of sulphate of baryta. 



Y. 0*398 grm., burnt with OuO and copper-turnings, gave 

 20*61 cubic centims. of nitrogen gas at 0° C. and 760 mil- 

 lims. N per cent. =6*51. 



(C t H,NBa0 2 ) 2 ,3H 2 0. p omi(L 





Calculated. 







« 









I. 



II. 



III. 



IV. 



V. 





! 



^ 



c 8 .. 



.. 96 



24-81 



24-88 

















H u .. 



.. 14 



3-62 



3-49 

















N 2 .. 



.. 28 



7-23 



— 



— 











6-51 



Ba 2 .. 



.. 137 



35-40 



— 



36-26 



35-64 



36-03 





O- .. 



.. 112 



387 



28-94 

 100-00 



~" 



— 



■ — ■ 





__ 



