IQ2 J. SAKUEAI. 



giycocoll (Kraut : op. cit., 30!)). It is to be observed, however, tliat 

 di- and triglycolamidic acids behave respectively as mono- and di])asic 

 acids towards alkalies nnd alkaline earths, the composition of their 

 anhydrous sahs containing :iIkaH metals nnd metals of the nlkaline 

 earths^^^ being- 



Diglycolamiclates. Triglycolamidates. 



Ba.(C,HeNO,), K, . CcH.NO« 



Ba.CeH.NO, ^'' . 



It is onl}?- those of their derivatives containing copper, silver, zinc, or 

 lead^^^-metals more or less characterised by the ease with which they 

 form ammoninted compounds — which may be regarded as dibasic 

 (MVCiHsTvjO.) nnd tribnsio (:\r3.C;HeX()«) salts respeotively. These 

 facts are unexjilicable by the accepted constitution of di- and triglycol- 

 amidic acids, but receive an ample and ready explanation from the 

 following formulae : 



Diglycolauiidic acid. Triglycolamidic acid. 



H,C-NHo.CH„.COOII H.,C-NH(CHo.COOm, 



II II 



OC-0 OC-0 ; 



the constitution of their salts or metallic derivatives being- 



H.C-NHo.CIio.COONH, H„C-NH(CH.,.COOK)., 



■| I ' II'' 



OC-0 OC-0 



(2) For the composition of these and other salts, see Heintz : Lieh. Ann., 122, 2G9 ; 124, 

 207 ; 156, 54 ; Lüddecke : Ibid., 147, 272 ; Beilstein : Hanâlmch, 3 Aufl., T, 1191-1192. 



(3) Barium forms another salt of the composition Ba3(r6HßNOe)2, but it readily changes into 

 the above dibasic salt on addition of acetic acid 



(4) A dibasic salt of lead of the composition Pb. CgHyXOe is also known. 



