918 Dr. R. D. Kleemau on the Attraction Constant of a 



values of (A 8 — — 2H) and (C + 2H) found for the second 

 set of alcohols in Table IX., we obtain for the calculated 



values of -; — 4=r respectively the numbers 27*95 and 25*31, 



which we see differ considerably from those obtained directly. 

 The reason for the disagreement appears to be that these two 

 alcohols are polymerized tit ordinary temperatures, which 

 gives rise to a displacement of the critical temperature. The 

 writer has shown that the liquids which we know (from 

 surface-tension and other considerations) to be polymerized, 

 usually do not fit in with the critical constant relations that 

 apply to normal Liquids. The polymerization of a liquid at 

 ordinary temperatures may thus affect the critical constants 

 although there may be no polymerization in the critical 



Mate. ' 



Sulphur ( ompounds. 



The sulphur compounds in Table X. are too diverse in 

 character to admit of being divided into groups the members 

 of each of which are connected by a simple relation. The 

 following relations may. however, be noticed. The chemical 

 formula for the first m compounds is S + 2H + a(C' + 2H), 

 where a. is an integer. We may therefore suppose that 

 there exists the relation 



A 8 -(S+2H + a(C + 2H))=(A 9 -S-2H)-«(C + 2H) = v ^= 



Now, it" we suppose that the value of (A 9 — S — 2H) and 

 (C + 2H) is the same for ethyl methyl sulphide and ethyl 

 sulphide we get, by subtracting one from the other, that 

 (C + 2H) = 3'25. If we suppose the values of these quantities 

 are the same for ethyl sulphide (one of the former compounds) 

 and methyl sulphide, we get (C-f 2H) =6*47. This value is 

 almost exactly double the former. Again, if we suppose that 

 these quantities have the same values for ethyl and isoamyl 

 sulphydrate we get (C-f 2H) = 3*23, which is almost exactly 

 half the previous value. And if these quantities have the 

 same value for ethyl and isoamyl sulphide (which corre- 

 spond to the sulphydrates) we obtain (C + 2H) = 1*37, which 

 is much smaller than the value obtained in the case of the 

 sulphydrates. 



When the critical constants for a larger number of sulphur 

 compounds are available some systematic relations should 

 be possible of being discovered by the help of which the 

 compounds might be classified into sets. 



