180 Dr. Tycho E:son Auren on 



Atomic „ , , 



number. Element. "*£- I. II. m . IV . 



30 Zn ZnCl 88'2 75'6 65*4 52'8 



ZnSO~ 4 88-2 79-6 68-7 56*5 



Mean 88-2 77*6 67'0 54-6 



33 As Na 2 HAs0 4 125-6 1137 98'4 801 



34 Se Se0 2 1430 1240 109-5 922 



35 Br NaBr 1525 137'7 1199 1000 



37 Eb EbCL. 204-3 132-1 153-0 128-4 



38 Sr SrCl 2 207'2 183-8 164-6 140-4 



Sr(N0 3 ) 2 207-8 188-0 168-8 142-6 



Mean 207'5 185-9 166-7 141'5 



42 Mo Mo 7 O 34 (NH 4 ) ... 267 239 219 185 



45 Eh EhCl 3 310 293 266 213 



46 Pd Pd(N0 3 ) 2 333 321 288 235 



47 Kg AgN0 3 327 322 313 247 



50 Sn Metal 331 364 372 347 



53 I Na[ 326 352 356 366 



56 Ba BaCl 2 340 357 387 425 



82 Pb Pb(N0 3 ) 2 675 608 544 460 



Generally the values of one and the same element which 

 have been obtained from different solutions agree very 

 closely. Only when using the hardest radiation (IV. 10 mm. 

 Al-filter) the difference seems to be somewhat greater on 

 certain occasions. The agreement in this case being less 

 good may in some part be due to decreased intensity of 

 radiation, and, therefore, the adjustment of the comparator 

 is more difficult. The principal cause is surely that a 

 small variation of the wave-length, in the almost homo- 

 geneous radiation, must have a proportionally greater 

 influence than when radiation has been less homogeneous. 

 The agreement of the values found in solutions of chemical 

 compounds with those found in the scrutiny of metals in 

 solid form (Fe, Ni, Cu) is particularly good. So there does 

 not appear to be any occasion for doubting the correctness 

 of the idea that absorption is purely an atomic quality, and 

 consequently that it is independent as well of the aggregation 

 form — except perhaps for C, as was said above — in which 

 the substance is taken as of the manner in which it enters 

 into compounds. More especially the strong rule of the 

 additative law is corroborated by the experiments shown 



