Products of the Radio-active Elements. 



261 



Neglecting for the present the results under ix and xxn, 

 which are types of secondary uraninites, it will noticed in an 

 examination of the numbers given in Table I that — . 



1. In specimens from the same general locality, viz.: from 

 Connecticut, from Norway and from North Carolina, a rough 

 proportionality is shown between the content of uranium and 

 the content of lead, rare earths, helium (nitrogen) and water. 

 A still more striking relation appears to exist between the pro- 

 portion of uranium in the form of the lower oxide, UO a , and 

 the amount of helium (nitrogen). This was remarked by Hille- 

 brand, who makes the following statement* in connection with 

 the results obtained from the analysis of the first eighteen samples : 



u Throughout the whole list of analyses in which nitrogen 

 has been estimated the most striking features is the apparent 

 relation between it and the U0 2 . This is especially marked 

 in the table of Norwegian uraninites recalculatedf, from which 

 the rule might almost be formulated that, given either nitrogen 

 or U0 2 the other can be found by simple calculation. The 

 same ratio is not found in the Connecticut varieties, but if the 



Table I. 









Norway. 









Texas. 



S. Carolina. 



Canada. 



Saxony. 



XII 



XIII 



XIV 



XV 



XVI 



XVII 



XVIII 



XIX 



XX 



XXI. 



XXII. 



30-63 



25-36 



22-04 



32-00 



35-54 



42 71 



26-81 



44-17 





41-06 



59-30 



46-13 



50-74 



43-03 



43-88 



43-38 



24-18 



44-18 



20-89 







34-67 



22-33 



66 



66 



57 



65 



68 



56 



61 



55 



71 



65 



68 



9-04 



10-06 



8-58 



9-46 



9-44 



10-54 



10-95 



10-08 



3-58 



11-27 



6-39 



6-00 



8-48 







8-98 



6-63 







4-15 



6-39 



1-65 



6-41 



o-o 



7-62 



9-03 



8-43 



10-48 



8-09 



13-42 



13-87 



19-19 



10-25 



10-49 



o-o 



1-17 



1-28 



1-08 



1-03 



1-08 





1-24 



0-54 





0-86 



0-02 



0-74 



0-73 



0-74 



0-77 



0-79 



l"-23 







1-48 





1-47 



3-17 



8-89 



9-14 



8-32 



8-96 



8-93 



7-50 







8-29 









6-89 



Of the samples from Norway XII was from Annerod, XIII and XIV from Elvestad, XV 

 from Skaartorp, XVI from Huggenaskilen, and XVII and XVIII from Arendal. Sample 

 XIX was from Llano Co., Texas, XX from Marietta, South Carolina, XXI from Villeneuve, 

 Canada, and XXII from Johanngeorgenstadt, Saxony. 



determination of nitrogen in the Branchville mineral is to be 

 depended on, the rule still holds that the higher the U0 2 the 

 higher likewise is the nitrogen. The Colorado and North 

 Carolina minerals are exceptions, but it should be borne in 

 mind that the former is amorphous like the Bohemian and 

 possesses the further similarity of containing no thoria, although 

 zirconia may take its place, and the North Carolina material is 



* This Journal, xl, 391 (1890). \ Excluding the insoluble matter. 



