On the Classification of Cartoon- Compounds. 
313 
If next in the hydrocarbon ethane the hydrogen atoms are 
assumed to be alike it will be evident that whereas there can 
be but one mono-hydroxy substitution product of ethane, viz.: 
^O — H 
C-H 
I 
l/H 
C-H 
there can be two di-hydroxy substitution products, 
inasmuch as both hydroxy groups can be connected with the 
same carbon atom, or can be more symmetrically distributed by 
being connected, one with each of the carbon atoms, viz.: 
^0—H 
-II 
—O—H 
C-H 
\H 
\H 
or 1 
^H 
!^H 
!— H 
C-H 
\o-ii 
For the same reason there can be two and only two tri¬ 
hydroxy substitution products of ethane, viz.: 
^0 —H 
! O—H 
C-O 
\0-H 
1 
or 
/H 
I^H 
!—H 
C-H 
\H 
^O 
two tetra-hydroxy substitution products, viz.: 
^O—II ^O— H 
C-O — H C—O—H 
I \0—H I \II 
I ^H 
C-H 
\0—II 
C-O—H 
\() - II 
one penta- and one hexa-hydroxy derivative, viz.: 
^O—II —H 
C—O-H C-O—H 
I \0-HI I \0— H 
i and 
! ^11 I ^O—H 
C —O—H C—O—H 
\0- -H \0 -II 
In propane, the third hydro-carbon of the paraffin series, there 
are two kinds of hydrogen atoms: six hydrogen atoms of the 
two methyl groups, aud two hydrogen atoms of the methylene 
group. The methyl hydrogens are connected with carbon 
atoms, which have three affinities saturated by hydrogen and 
