o~)2 Prof. W. H. Bragg on the Ionization of 



This is close to the value in the table, viz., 24V4. But Dewar 

 also finds H 2 to be 28, which is much larger, than the value 

 used in the ordinary formula. 



v/ZcsXlO. 



B. 



ksiBxMfi. 



223 



75*5 



5-8 



242 



87-5 



55 



254 



430 



3-9 



236 



36-0 



39 



241 



830 



5-3 



252 



47 



52 



244 







197 



80-0 



6-8 



208 



720 



5-7 



227 



55-5 



5-6 



193 



52-0 



6-6 



215 



(58-8 



5-8 



207 



50-0 



6-0 



222 



300 



5-8 





29-0 



5-3 



2i2 



190 



61 



460 



8 V 6 



2**8 



AX 102. 



sxio 2 . UsxlO 2 . 



C e H 6 . 

 C.,H 4 ". 



c.jr , . 



. 129 



. 135 



.! 128 



. 126 



O 4 H 10 O 132 



G,H ( .0 



oli,o 



CCl t ... 

 OHOL 

 C,H 5 C1 

 CH :3 I... 



aii-i 



OS., ' ... 



co; ... 



N„6 ... 

 0.' 



K 



h: 



1% 



122 

 132 

 129 

 132 

 133 

 128 

 137 

 108 

 105 

 109 

 96 

 100 



333 

 359 

 135 

 111 

 333 

 200 

 143 

 400 

 316 

 236 

 258 

 312 

 218 

 147 

 146 

 105 

 96 

 24 



430 

 485 

 173 

 140 

 440 

 246 

 174 

 528 

 408 

 312 

 343 

 400 

 299 

 159 

 153 

 115 

 94 

 24 



96-0 



1170 



440 



33-0 



106-0 



620 



425 



104-0 



85-0 



710 



66-0 



86-0 



62-0 



354 



24 : 4 



ii : o 



The value of k for H 2 is set down as 100. This is only 

 approximate, and is probably too high. Its accurate deter- 

 mination will require the construction of special apparatus. 



The agreement between the ratios v/ks in the fifth 

 column is not such as to show that v and ks are directly pro- 

 portional ; but it is good enough to suggest strongly that 

 rest immediately on some more fundamental 

 The case is even a little stronger than appears at 

 since it is clear that H 2 contributes an abnormal 

 the molecular volumes ; the ratio v/ks is high 

 in the molecule. Moreover, the 

 run closely parallel, as is well 

 volumes, and in general the con- 

 nexion between the various physical properties of the mole- 

 cule and its volume is more obvious than any connexion with 

 its molecular weight. Consequently the quantity ks is closely 

 related to most of the physical properties of the molecule. 

 As a second instance, I have put in the sixth column of the 

 above table the respective values of Sutherland's molecular 

 volume B (Phil. Mag. Jan. 1895), and shown in the last 

 column that this also is closely connected to ks. According 

 to Sutherland, B tends to be proportional to the electric 

 moment of the molecule. In this case also the variations in the 

 ratios (see the last column) seem to be due to abnormalities 

 in B rather than in ks ; e.g., C 2 H 2 and C 2 H 4 would fall into 



they both 



property. 



first sight, 



amount to 



whenever H preponderates 



molecular refractions also 



known, with the molecular 



