198 Dr. Tycho E:son Auren on 



e are 5 ou 

 after the fo 



100 + 5q _ 



assuming that there are 5 outer electrons in Cu and 6 in 

 H 2 0, consequently after the formula 



0-91 + 6? ~ , *Cu/H a O ( 14 ) 



Fig. 3. 



It appears from the table that q practically is for 

 radiation of greater wave-length than X = 0*42, which 

 roughly indicates the limit of the absorption-zone in the 

 J-radiation for carbon found by Barkla. With diminishing 

 wave-length q increases, as shown in fig. 3, where the 

 values of q found in Table XII. are graphically indicated, 

 very rapidly to a wave-length of about 0*37, whereupon 

 q continually increases with a still more diminishing wave- 

 length. In regard to the fact that characteristic radiation 

 of the wave-length indicated for J-radiation according to 

 what has been mentioned by Siegbahn f has not been 

 possible to state directly, there is good evidence for believing 

 that this same increase of scattering within the range of 

 \ = 0*42-0\37 is the cause of the increase of absorption that 

 has been the occasion of supposing an especial J-radiation. 



It is seen from the table that q— Cu , beginning at a 



wave-length of \=0'37, is nearly constant with a dimi- 

 nishing wave-length. Starting from the medium value 



(0*678) of the values found for q- ClV one readily finds 



the value of q when - Cu for the wave-length in question 

 P 



* Siegbahn, Die Naturwissenschaften, Heft xxxiii. (1917). 



