468 



Transactions. — Chemistry and Physics. 



acids in phenol (see above, Article LVL), whose rates of 

 association alternately increase and decrease. If the even 

 members alone are considered it is found that the rate slowly 

 falls to a minimum, and then rapidly increases. 



(2.) When the Compounds are Liquids. — (a.) The Boiling- 

 points of the Fatty Acids and their Derivatives, the Ketones, 

 Nitroparaffins, and Nitriles : If the boiling-points of the fatty 

 acids are considered a continual increase is noticed. On 

 taking successive differences, however, the numbers obtained 

 are of a wavy nature. As is seen in the following table, the 

 second set of differences decreases, reaching a minimum and 

 then increasing again. The other series also decreases, but 

 more slowly, perhaps reaching a minimum higher up the 



series. 



Table V. 



Differences. 



23 



23 



19 



18 



22 



19 



12 



15 



Differences. 



The same alternate rise and fall is shown if the boiling- 

 points are taken at a pressure of 100 mm. In this case, 

 however, the even to odd differences are smaller, and reach 

 the minimum first, whilst at atmospheric pressure the reverse 

 is the case. 



Table VI. 



Boiling- 

 point. 

 ... 185° 



... 202 



... 213 



... 226 



... 236 



... 248 



... 257 



... 269 



... 277* 



... 287 



... 298 



Acid. 



c 9 



Ci 



C 13 



c 15 



C 17 



c 



y 18 



c 



19 



11 



10 



8 



11 



17 



13 



12 



12 



10 





This behaviour of the fatty acids is probably due to the 



This boiling-point is interpolated. 



