98 
In the series of the normal fatty acids the difference 
between the boiling points of the lower members is also 
constant, being 22°, but afterwards it becomes less. 
Normal Fatty Acids. 
Observed. 
Calculated. 
Difference. 
Acetic 
c 2 h 4 o 2 
... 118° .. 
118° 
Propionic C 3 H(; 0 2 
140-6 .. 
. 140 . 
. 22° 
Butyric 
c 4 h 8 o 2 
163-2 .. 
162 . 
. 22 
Pentylic 
c 5 h 10 o 2 
184-5 .. 
. 184 .. 
. 22 
Hexylic 
c 6 h 1s 0, 
... 204-5 .. 
206 
. 22 
Heptylic 
c 7 h m 0. 
... 220 
Octylic 
c 8 h J6 o 2 
... 233 
Nonylic 
c u h 18 o 2 
... 254 
