of Homologous Compounds. 



447 



The simple formula gives a difference of +41-2 for methane 

 and of +24-7, 19-9, 10'6, 7 -9, 4*6 and 2'4 respectively for the 

 succeeding- members of the series. 



Normal Alcohols. 



The line which passes through the points given by the 

 molecular weights and boiling points of water and the alcohols 

 is sharply curved at the beginning and then it becomes almost 

 straight. The following linear equation gives the boiling points 

 of the alcohols T= 286-2 + 141 M and the following table gives 

 the observed and calculated numbers in absolute degrees. 



Aldehydes and Ketones. 



The boiling points of these are also given by linear equations 



(1) Aldehydes T= 20914 + 1-9286 M. 



(2) Ketones T= 25007 + 1 4643 M. 



The observed and calculated numbers in absolute degrees are 

 given in the following table. 



