J. Schiel on Classification by Series. 53 
€sHs@4 lecanoric acid. €oHwO,4 veratric acid. 
Acid series VI. 
€,,Hen-100-2 
€,Hen-i0@2 
€nHon-1002 
Of the acids deriving from this generic series only a few are 
OWN as yet. 
€,H»@3 cumaric acid. €7H,@7 mionic acid. 
€sH@, phtalic acid. 
€2H3g0,, choloidie “ 
€25H4084 hyocholice “ 
From other known acids it is hardly possible to form series, 
as they stand mostly isolated ; there is for instance only one acid 
—anemonic acid €, ,H, ,@,—known as yet, which corresponds 
with the general formula €,H,,_,,0;- 
. +H generic series of acids considered above may be ranged 
nto one primitive series: 
€nHon _3 02x 
€;,Hon-100 2x 
where @ means, that in order to form a generic series from one 
of these primitive formulas, © has successively to receive suffixed 
the numbers 2,3,4,...a, Itis easy to see that as every generic 
Series, as for instance: 
€,H2n202; €sH2O,, €3HsOs, €aHeO2... 
€nHon-203; €cH2O3, €3HsOs, €sHeOs . 
€nHon-2O1; €oHeOs, €3HsO4 €sHeOs . 
€,Hon 28; ; €2H29s, €3H49s, €,H¢Os rere 
consists of two kinds of series, of which those lying on the hor- 
wzontal lines are homologous series, and those lying on the verti- 
cal lines are series of oxydation, the primitive series therefore 
expresses a seriation in a : : y ; 
t is worth observing that there may be series of isomeric 
Substances running parallel to each other ; such series may be 
called homarithmical series. 
