of Diffusion for Non- Electrolytes, 783 



10 6 B"D which we are studying. H. Euler's values for the 

 diffusion coefficients of (Jl a and Br 2 are added at the right 

 hand of the table: — 



10D.... 



B... 



10 6 B3D. 



166 



30 

 51 



10 ,; ealcul. 41 



Nff 3 . 

 132 



50 



2 . 



167 

 193 

 4 4 



51 



178 

 22 

 50 



48 



N 2 0. 



156 

 20 

 48 

 44 



CI,. 



127 

 38 

 43 

 40 



H 2 . 



474 

 8-6 

 97 

 73 



CI, 



154 



38 



52 



40 



101 

 52 



38 

 37 



In the next table the coefficients of diffusion are those 

 found by Thovert for a number of non-electrolytes in water 

 (Comptes RenduSj cxxxv.). 



Alcohols. 





Methyl 



Ethyl. 



AIM. 



Propyl. 



Butyl. 



Amy 



10 7 D 



137 



Ill 



99 



98 



88 



88 



B 



26 



425 



52 



59 



75-5 



92 



10 6 B*D... 



41 



39 



37 



38 



37 



40 



10* ealcul. 



46 



39 



37 



36 



33 



32 



Other Substances. 



Hydro- 

 Urea. Urethane. Glycerol. Phenol. quinone. Resorcin. 



10 7 D 98 87 79 80 73 75 



B 51 75 72 80 85 85 



10 ,J B*D... 36 37 33 34 32 33 



10* ealcul. 37 33 34 33 32 32 



Pyrogallol. Glucose. Mannite. Antipyrin. Maltose. E-affinose. 



10 7 D 66 57 55 57 41 35'5 



B 90 134 141 166 254 374 



10 C B*D... 30 29 20 31 26 26 



10* ealcul. 32 20 29 28 26 26 



In spite of irregularities it can be seen that the chief 

 tendency is for the product 10 6 Bi D to diminish with increasing 

 value of B and to seemingly converge to a lower limit, as is 

 required by the theory. But the case of H 2 makes it 

 impossible to recognize convergence to the upper limit 

 required by the theory. The other gases in an irregular 

 way fall in with the idea of convergence to an upper limit. 



3 F 2 



