zo 

 PtFiciEncits 



SILICA 



so ao 



EXCES9ES 



Figure 4. — Series supposed to be related genetically, but not showing clear Gradations 



in the ivhole Range of Specimens 



Small spots show standard rocks, as in figure 1. 



A = Almunge. Sweden (set plotted probably incomplete: Bowen (op. cit.. pages 63-4) 

 says these are transitional to granite) ; As = Ascutney Mountain, Vermont (whole 

 series here ; only a slight variation appears in a single stock (diorite) ; (author favors 

 syntexis) ; B = Bearpaw Mountnins, Montana (whole series here; one mass shown in 

 figure 3) ; C = Castle Mountains, Montana (whole series here ; one mass shown in 

 figure 3) ; D = Central Wisconsin (diorite) ; E = Electric Peak, Yellowstone Park ; 

 F = Crystal Falls. Michigan (transitions in single mass are known, but the analyses 

 are not all from such a single mass) ; G = Central Wisconsin (granite) : K = Kruger, 

 British Columbia (spreads widely over the plot) ; I, = Little Belt Mountains, Montana 

 (whole series here; Yogo Peak separately in figure 3) ; M = Monteregian Hills, Quebec 

 (whole series here; several single masses in figure 3) ; O = Old Hampshire County, 

 Massachusetts ; P = Pyramid Peak, California ; R = Remmel, British Columbia ; S = 

 Slesse, British Columbia ; T = Tripyramid Mountain, New Hampshire (outcrops include 

 an aplite with some quartz, not analyzed) ; V — Cuttingsville, Vermont ; X = Cortlandt, 

 New York, 



(627) 



