300 Mr. Frederick Bedell on 



where I — | is the value for hydrogen at 0°, and this is 



Vo-o/h 



where A=l atrno. 



•000089b' 



Also NM= 1000/3. 



Substituting these values we obtain 



p— Vl 1. Ap(l + «Q 

 N'M' 0-0000896 



= 22-3wA(l + af). 



If a has any other value than 1 we must put 



P = 22-3anA(l-f«0j 



whence we see that if each salt molecule combines with two 

 or with three solvent molecules the osmotic pressure is double 

 or treble the normal value. 



The supposition here made is no doubt crude in its 

 simplicity, but my attempts to introduce other considerations, 

 such as change in density in the solution, have led to such 

 complicated results that much more extravagant suppositions 

 had to be made to reconcile these results with experiments. I 

 therefore leave the hypothesis in this crude form, in which it 

 will at least serve to show that it is not necessary to ascribe 

 osmotic pressure to dissociation but rather to association or 

 some kind of combination of salt and solvent. 



XXXII. Admittance and Impedance Loci. 

 By Frederick Bedell*. 



P~pHE quantities chiefly considered in the discussion of 

 JL alternating currents are electromotive forces and cur- 

 rents, the values of these being determined for different con- 

 ditions. Electromotive forces and currents are commonly 

 represented by vector diagrams ; and the change in these 

 diagrams, as some one quantity is varied, is shown by the 

 loci of the vectors which are altered thereby. What may be 

 termed electromotive force and current loci are thus deter- 

 mined. The numerical values for which these are constructed 

 necessarily depend upon some condition involving an assumed 



* Communicated by the Physical Society : read June 26, 1896. 



