106 Prof. J. G. MacGregor on the Relation of the Physical 



For viscosity l-k for NaCl is -O0022, and for KOI 



— 0*0028. We may thus expect a closer approximation to 

 constancy than in the last case ; and from Bruckner's obser- 

 vations we find 



Forw = 0-5. 1-0. 1-5. 2-0. 2-5. 



(Pi-P,)/n= -00116 -00122 -00126 '00128 -00135 



For surface-tension l-k for NaCl is -0*096, and for KC1 



— 0*116. The approximation will thus not be so close as in 

 the last case. Rother's observations give, by graphical inter- 

 polation, 



Forn = 1. 1-5. 2. 



(Pi-P s )/-n= '016 -0113 -0105 



For refractive index Z — k for NaCl is '0054, and for KC1 

 '0091. The approximation will thus be still less close in this 

 case. Bender's observations give for the D-line, 



For n = 

 (Pi-Pi)/n= 



•0,29 



2. 

 •0,17 



3. 



•0 3 24 



The above account of this phenomenon may be further 

 tested by the aid of Kohlrausch's observations of conductivity; 

 for in this case Z — k is the molecular conductivity at infinite 

 dilution (^ a ) . The following values of differences of molecular 

 conductivity will be sufficient : — 



n. 



(P 2 — P 2 )/n for Conductivity. 



HOI and Nad 



HCl and 

 ftC0 3 . 



£H 2 S0 4 and 

 AgNOj. 



AgN0 3 and 

 Nad 



001 

 01 

 0-5 

 10 



2454 

 2379 

 2260 



2085 



2333 

 2365 



2289 

 2120 



1838 

 1198 

 1171 

 1185 



+55 

 + 21 

 -29 

 -60 



Compare with this the following table of values of fi Q 

 and a ; — 



