4 
, 
J. Schiel on Classification by Series. 49 
--. By this we have the following series: 
I €nHon. 20 IL. €,H2,0 Ill. €yHen-28 IV. €nHon_1O 
€nHon4202 €nHenPe2 €nHon-282 €nHon_402 
€nHen4 203 €nHonP3 €yHon-203 €nHen493 
and so forth. 
Every general formula in one of these generic series represents 
special homologous series the members of which have the dif- 
ference n€H,. When comparing the above series with the hy- 
drocarburets known to exist in a free state, they will be found 
to represent different states of oxydation of these hydrocarburets. 
nother kind of series is formed by making in the general 
formula «=n and =n and making 8 successively to decrease or 
merease, the increment or decrement being 1, 2,3,4,.... By 
this we form the series 
b 
of which are distinguished by m€ H and which I therefore call 
these groups is the following: 
€nHons2 hydrurets of the radicals of the alcohols; 
€xHon the homologues of ethylen and the radicals of the alcohols ; 
€uHon-2 acetylen n=2; allyl n 
€.Hon-4 thymen n=10; 
along benzol n=6, toluol n=, xylol n=8, cumol n==9, cymol n=10. 
an@s 
€,Hen-1 stilben n= 14; 
€nH2n-20 hydrocarburet found in the tar of Archangel n=19. 
€ maximum or minimum number of atoms of hydrogen 
which may be combined with n atoms of carbon cannot be deter- 
bs ; : oms of hyd are 
an ai ccee iach aati ee, For this veces idee totaal of 
Quinine for instance, could not be written C10 Hi2 NO, as chemists formerly used 
to do, but C2oH24Na@2 as it is written now for other reasons. 
Ax. Jour. Scr,—Srconp Series, Vou. XXXII, No. 94.—JULY, 1861, 
7 
