M. C. Lea on Triethylamine. 67 



This refers to tubes ctarged from three-sevenths to one-half. 

 Beyond this charge, greatly increased strength becomes neces- 



The disposition to burst appeared to be greater in the second 

 healing than in the first. It is therefore better to heat for 11 

 or 12 hours to 180°-190° F. rather than risk the loss of products 

 which have already cost considerable time and trouble. 



In describing the properties of ethylamine and diethylaminc, 

 I have shown that when nitrate of ethyl is made to react upon 

 ammonia, the resulting alkaloids are easily separated from each 

 other by means of picric acid. It is a fiimiliar fact that when 

 several salts are present in one solution, the facility of separating 

 them by crystallization will often depend upon the relative pro- 

 portion in which they are present, and this holds good in the 

 present case. When ammonia acts upon nitrate of ethyl, and the 

 bases, after separating the ammonia, are converted into picrates, 

 we have a mixture of the salts of ethylamine and diethylamine 

 in nearly equal quantities, with a variable quantity of triethyla- 

 mine, always very small and sometimes a mere trace, always sep- 

 arating out in the first crystallization. But when nitrate of ethyl 

 IS made to react again upon the products of the first reaction, the 

 proportions of the alkaloids are very different. Diethylamine 

 then constitutes about three-fourths of the whole, and the residue 

 13 chiefly triethylamine mixed with some ethylamine. When 

 these bases are converted into picrates the diethylamine salt still 

 separates with great facility, sinking to the bottom at a certain 

 stage of concentration as a heavy oily fluid.f Previously to this, 





