28 



M. J. A. Groshans on the 



(4) A comparison of the constants of these four series and 

 of many others has shown that it is possible to express the 



J. 71 



series of constants — by the formula 



Tn 



= 27-8.*/ 



x> 



where x=l, 2, 3, 4, &c. 



(5) In the four series above, 



but in other series, 



x — m ; 



y being a small number ; thus, in the ethylic alcohol series, 



x = m + 3. 



Tw 



The constant — in Table X. corresponds to #=5. It is 

 a 



also the constant for water, and it is for this reason that I 



have adopted the value 27*8. For with water we have 



(273 + 100)^ x 4- =27-801. 

 lo V5 



On this basis are calculated the constants for various values of 

 x given in Table XII. 



Table XII. 



X. 



Tm/a. 



x. 



Tnl a. 



X. 



7. 



Tn/a. 



1. 



27*80 



4. 



55-60 



73-56 



2. 



39-32 



5. 



62-17 



8. 



78-63 



3. 



48-15 



6. 



68-10 



9. 



83-41 



In the following table are given the boiling-points, observed 

 and calculated, for the first sixteen ethers of the series G n H 2n 2 . 

 The formula used in the calculation is 



l T=(273 + S )=^27-8^ / m. 



