44 



Penfield and Stanley — 



The proportion of the various radicals and of the remaining 

 bases in the foregoing analysis are as follows : — 





Eatios 



Per cents 



[Al 2 0(F,0H o ]"0 



•065 



8-8 



[A] 1 4 RNaj"0 



•059 



8-0 



[Fe,Mn,Mj?]0 



•409 



55-4 



[Ca,NaJO 



•1S6 



25-2 



H 2 



•019 



2-6 



•738 



100-0 



From the foregoing interpretation it may be seen that all of 

 the fluorine and about half of the hydrogen are needed to 

 form the alumo, fluor-hydroxyl radical ; that sodium is present 

 in just about sufficient amount to form the second basic radi- 

 cal, and that calcium plus the trifling excess of sodium satisfies 

 25 per cent of the hydrogen atoms of the amphibole acid. 



Analysis VIII, Edenyille, N. T. 



rSi,Ti]0, 

 Al,Fe] o 3 

 "Fe,Mn,Hg]0 

 CaO 



[K,Na],0 

 H„0 

 F" 



Ratios 



•717 

 •129 

 •481 

 •209 

 •050 

 •030 

 •021 



fAl- 



i : 



LAI- 



-(F,OH)"l 

 >0 | 



-(F,OH)J 



r 



Al< 



•051 

 •051 



•051 



Residue 



•666 

 •078 

 •481 

 •209 I 

 •050 ) 



AK 

 ,0- 



-Na' 

 >R 



[_ A1 \0— Na 



—•078 

 —■078 

 —•078 



— •078 



Residue 



•5S8 



•403 

 •181 



Total RO = -584 



Proportion of radicals and remaining bases : — 



Ratios Per cents 



[Al a O(F,OH)„]"0 -051 7-1 



[Al„"0 J RiSX]' r O -078 11-0 



[Fe",Mn,MgjO -403 56'5 



CaO -181 25-4 



100-0 



According to the interpretation, in this analysis all of the 

 fluorine and water are needed for the alumo4iydroxyl radical ; 

 sodium is not quite sufficient for' the second basic radical, so a 

 very little of its nearest related constituent, calcium, is taken ; 

 in the final residue Si0 2 and RO are present in the proportion 

 •588: 584 or 1 : - 992; while again it is found that the residual 

 calcium satisfies 25 per cent of the hydrogen atoms of the 

 amphibole acid. 



