258 Proceedings of the Royal Society of Edinburgh. [Sess. 
type CM 4 . This enumeration, however, does not appear to possess any great 
practical utility, and it is perhaps preferable simply to denote it in an indefinite 
manner by adding “n ” to the true type CM 4 
C - 0 -OH 
: "H 2 
C — H 2 
In like manner the butyle alcohol is to be viewed as , and so on 
C H 2 
C " H 3 
throughout all the series of these alcohols. The constitution of the aethers will be 
evident : 
C'" 0 °" "C 
:""H 2 H 2 * 
C H H C re p resen £ s the m ixed butylic-ethylic aether. 
C—H 2 
C—H 8 
.0- OH 
Formic acid is represented by the form C v O 2 ; acetic acid in like manner, 
H 
C " 0 OH 
; - 0 2 
C -H 3 
C — 0 OH 
O 2 
Propionic acid is g 
C " H 3 
The constitution of glycol may be 
represented as follows : — 
q "O'" OH 
: H 2 
6"-h 2 
O—OH 
* The vertical dotted lines between the two “ C’s ” is omitted in the original. 
