Boiling-point as related to Chemical Composition. 187 



It is interesting to notice that the boiling-point of olefiant 

 gas, as calculated from the (even) equation, is — 104-73. 

 Olefiant gas is said to liquefy, under considerable pressure, at 



— 110°. As it is probable that, near the boiling-point, large 

 differences of tension correspond to small differences of tem- 

 perature, the calculated number may be taken as fairly correct. 

 There is theoretically also a butylene boiling at — 9'41, but not 

 yet known. Again, the calculated value of y 12 lies remark- 

 ably near the mean (216'05) of the divergent experimental 

 numbers. The correction for exposure of the mercurial 

 column is included in the data given by Warren and Storer. 

 The above table comprises all the olefines whose boiling-points 

 admit at present of seriation. 



24. The melting-points of some of the normal primary fatty 

 alcohols have been published since the above paragraphs were 

 written. Of these, y 2 was determined by Wroblew T ski and 

 Olszewski* ; y 10 , y\ 2) yu, y\% are due to Kraffts f. Frentzelf 

 gives the solidifying-point of hexylic alcohol, in a mixture of 

 solid carbonic dioxide and ether, as " consequently under 



— 30°." The equation, deduced from y 2 , yi , and y xs on the 



assumption that -=26 x modulus, is 

 7 



10-241 0-9-2879) 



2 



6 

 10 

 12 

 14 



18 

 oc 



This series enables us to add a seventh infinite olefine 

 (n = 26) to the six already recorded in melting-point. 



* Comptes Hendus, xcvi. p. 1140. 



t Berichte, xvi. p. 1714. \ Ibid. p. 743. 



1 + -058887 O- 



-9-2879) 



y- 

 -130-5 



y calc. 

 -130-75 



... 



- 41-77 



+ 7 



+ 7-00 



24 



23-95 



38 



37-78 



59 



58-97 



• • • 



173-91 



