1081 

 And so also: 



V TjcJx V ^^- /l 

 According to the values given by Sydney Young s[l-\-{n — 1)^'^. 

 has the value 4,52 for methyl alcohol, 4,02 for etliyl alcohol, and 

 also 4,02 for propyl alcohol. With *• ^ 3.77 we found for: 

 Methyl alcohol 'i -\- {n — 1)^'^=:1,2 

 Ethyl alcohol 1 + (n— 1)^1- = 1,0663 

 Propyl alcohol 1 + {n—l),Vk = 1.0663 



Now for these three substances ( ^ is respectively e(pial to: 



6,52, 8,2 and 10,7. 

 By the aid of the value of 1 + {n — 1).i'a- for these three substances 



we calculate ( — J or i^j, and then we find : 

 \PkJ 



5,43, 7,69 and 10,03 

 The differences are almost equal, viz. 2.26 and 2.34, but they are 

 smaller than what we have found for CH., in the series of the saturated 

 hydrocarbons, and this seems inexplicable for the time 'being. Unless 

 we might assume that an atom C, when bound to 0, is smaller 

 than when it is bound to H, and that besides it could also impart 

 this property to other atoms C to which it is bound. The value for 

 ethyl alcohol calculated here is, however, in perfect agreement with 

 the value for ether calculated in the preceding communication. 

 With b for ether equal to 13,12 follows the value 7.60 for 

 alcohol by subtraction of 2 X 2.76. For methyl ether, for which 

 we found h = 7.55 before, we could now find 5.43, by putting 

 CH, =: 2.12. But this is possible, when C bound to should be smaller 

 than C bound to C. The difference, however, is then greater than 

 could be expected. So that we are again confronted with the question 

 whether in case of quasi-association circumstances occur -which we 

 have not yet duly taken into account in our discussion. This, how- 

 ever, is quite beside the subject of tbis communication which purposes 

 to show that we may consider the quantity ,9 as entirely, or almost 

 entirely of the same value at least for polj'atomic molecules. The 

 slight difïerences are then entirely subject to the relation given by 



s' 64 

 me before - — - = -— , which, however, only holds unmodified for nor- 

 ƒ-! 27' 



mal substances ; the value of s for associating substances has been 



discussed here, and a closer investigation about the value of ƒ for 



such substances would also be desirable. 



