118 ON THE BOILING-POINTS OF PARAFFINS. 



Whilst in these series the difference between the boil- 

 ing-points steadily diminishes, in the series of the normal 

 alcohols the difference appears to remain the same, being 

 about 1 9 . 



Normal Alcohols. 



Observed. Calculated. 



Ethyl, C 2 H 6 O 78-4 78-4 



Propyl, C 3 H 8 O 97 97 



Butyl, C 4 H 10 O 116 116 



Pentyl, C 5 H 12 O 137 135 



Hexyl, C 6 H 14 O 156*6 154 



Heptyl,C 7 H 16 173 



Octyl, C 8 H 18 O 192 192 



In the series of the normal fatty acids, the difference 

 between the boiling-points of the lower members is also 

 constant, being 2 2°, but afterwards it becomes less. 



Normal Fatty Acids. 



Observed. Calculated. Difference. 

 Acetic, C 2 H 4 2 118 118 



Propionic, C 3 H 6 2 140-6 140 



Butyric, C 4 H 8 2 163-2 162 



Pentylic, C 5 H 10 2 184-5 1 84 



Hexylic, C 6 H 12 2 2 °4'5 206 



Heptylic, C 7 H u 2 220 



Octylic, C 8 H 16 2 233 



Nonylic, C 9 H 18 2 254 



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