152 Journal of the Mitchell Society {^Jan. 



dryness in the heating flask in a current of dry nitrogen under 

 reduced pressure, barium hydroxide solution was then filtered 

 into the precipitating flask and the temperature of the heating 

 flask slowly raised, nitrogen being drawn through the flask 

 throughout the experiment. 



The acids melted at about 73 °C., but no gas evolution could 

 be detected in the melted mass, even while the temperature 

 was being raised to 140° C. and so maintained for an hour, nor 

 was there the slightest precipitation of barium carbonate in the 

 precipitating flask. It is evident, therefore, that these resin 

 acids, if protected from oxygen and thoroughly freed from 

 water, are perfectly stable at 140° C. 



Chapei, Hm, N. C. 



