348 



Prof. J. Dewar and A. Scott. [June 21, 



silver determined, after the method of Stas, with the following 

 results : — 



Weight of salt 

 in vacuo. 



6 -6248 

 8 -24088 



Weight of silver 

 in vacuo. 



3 -9219 



4 -8798 



Molecular weight 

 of (C 2 H 5 ) 8 N.HBr. 

 182 -313 

 182 -270 



A portion of the same fraction of the base was now treated with 

 nitrons acid in order to eliminate traces of primary and secondary 

 amines, and the titration repeated with the following results : — 



Weight of salt 

 in vacuo. 



5 "3165 

 4 -6237 



Weight of silver 

 in vacuo. 



3-1519 

 2 -74194 



Molecular weight 

 of (C 2 H 3 ) 3 N.HBr. 

 182 -052 

 182 -001 



The effect of the nitrous acid treatment has been to lower the 

 molecular weight, thus proving the presence of small quantities of 

 bases derived from more complicated radicals than ethyl, probably 

 propylamine. 



After these preliminary determinations the whole of the sample 

 of triethylamine was fractionated with great care, and the por- 

 tion boiling between 90° and 91° C. selected for a repetition of the 

 process. The middle portion of this second distillation boiling 

 between 90 o, 2 and 90°'4 was again separated into three fractions by a 

 new distillation and the molecular weights of the respective samples 

 of the base determined. The following table gives the results of the 

 different titrations : — 





Weight 



Weight 



Molecular 







of salt in 



of silver in 



weight of 



Remarks. 





vacuo. 



vacuo. 



(C 2 H 5 ) 3 KHBr. 





I.,.. 



7 '06272 



4-18778 



182 -025 



First samples, boiling 

 point 90—91°. 



II.... 



6-4418 



3-8199 



182-011 



Second fraction of I, 

 boiling point 90° ■ 2— 

 90° -4. 



III. . . . 



15 -46765 



9 -18495 



181 -756 



First portiou of II re- 

 fractionated. 



1V\. .. 



11 -95685 



7 -0902 



182 -012 



Middle and chief por- 

 tion of II refraction - 

 ated. 



Y 



13 -9522 



8 -2664 



182 -166 



Highest boiling point, 

 portion of II refrac- 

 tionated. 



The molecular weights of the different samples clearly prove 

 that the base is not homogeneous, the presence of bases of higher 



