346 



MESSRS. E. FBANKLAJSD AND B. F. DUPPA'S 



2nd. Etheric Normal Acids. — An etheric normal acid of the lactic series is constituted 

 like a normal acid, but contains a monad organic radical, chlorous or basylous, in the 

 place of the hydrogen of the ncm-oxatylic hydroxyl. The following is therefore the 

 general formula of these acids: in the graphic formula n, as before, may =0. 



or 



(CO 



+ + 

 HRo 



Ho 



The number of possible isomers belonging to this division is very great ; for, in addition 



+ 

 to those of which the normal acids containing E, of the same value are susceptible, a 



+ ± 



host of others must result from the complementary variation of R and R. The lowest 



member of the division, methylglycollic acid (isomeric with lactic acid), is the only one 



incapable of isomeric modification. 



The following examples will serve to illustrate the constitution of the acids belonging 



to this division : — 



f C TT 

 Methylglycollic acid i n r» ^ 



, Meo 



Ethyl-lactic acid 



Aceto-lactic acid 



Ho 



Me H Eto 

 Ho 



CMeH Aco# 

 CO Ho 



rcM 

 Ico 



3rd. Secondary Adds. — A secondary acid of the lactic series is one in which an atom 

 of carbon is united with oxatyl, hydroxyl, and two atoms of an alcohol radical. The 

 general formula of these acids is 



or 



(CR2H0 

 Ho 



|CR. 

 (CO 



In the graphic expression the values of n and m may differ ; but both are positive 



* Aco = peroxide of acetyl, C^ H, 0,. 



