812 Molecular and other Constants of the Inactive Gases. 

 the calculations of Sirk (I.e.). The gist of both papers is 



that the Clausius' equation L = — = should be replaced 



-j \/27rNcr 2 



by the equation L = — -=-— — — — , where the factor F has 

 the value e T according to Reinganum and the value 1 + „, 



according to Sutherland, c and C being constants and T the 

 absolute temperature. These modified equations had been 

 already deduced by their authors to account for the change 

 of viscosity with temperature which, as is well known, does 

 not take place in accordance with the relation 7j = JcpIjCl, 

 L e. rj cc T*, L being considered constant. From Schierloh's 

 measurements of rj I have calculated c and C for A and He. 

 The results are for He, c = 59, C = 78*2, and for A, c = 108, 

 C = 174'6. The factor F has, therefore, the following values 

 (T=273):— 



a. F = £ T . 



b. F=l + 



HeliumF = 1-217. 

 Helium F= 1-286. 



Argon F = 1-482. 



Argon F=l-64. 



The effect of F is to increase all values of a calculated in 

 Part I. § CI in the ratio F : 1, and to decrease those calcu- 

 lated in Part I. § C3 in the ratio 1 : VF. The values of a 

 calculated in Part I. § C2 are, of course, unaffected. The 

 following table gives the new values compared with those 

 calculated in Part I. of this paper: — 







I 



^allies of a x 10 8 cm. 













V =g^- 



<r=6\/2VL. 



ff =4'58 a/2VL. 



a 



rrom r\. 



Helium. 





*f- 



S. 



E. 



B/. 



S. 



i 

 E.| 





ty. 



s. 



E. 



V from b 



2-3 



4-35 



5-6 



5-3 



3-32 



4-27! 4-04 



Meyer... 



1-696 



1-49 



1-53 



V from fi 



117 



0-56 



072 



0-68 



, 0-456 



055 



052 



Jeans ... 



202 



1-78 



1-83 



Argon. 







| 











V from b 



2-86 



2-87 



4-62 



4-26 



2-19 



36 



3-25 



Meyer... 



2-85 



223 



2-34 



V from bn 



3-36 



4-57 



7-5 



678 



; 3-49 



5-73 



518 



Jeans ... 



3-39 



2-65 



2-78 



V from jj. 



235 



1-59 



2-6 



2-35 



1-21 



1-99 



1-79 



I 









The columns R/' give the values calculated in Part I., 

 S those using Sutherland's formula, and R those using 

 For bn vide infra. 



Reinganum's formula. 



