282 



Report S.A.A. Advancement of Science. 



quartz occurs as a sort of mosaic of more or less rounded crystals, 

 which are often enclosed in allotriomorphic crystals of feldspar, and 

 it is clear that the quartz has crystallised for the most part before 

 the feldspar, as in the Shap granite and elsewhere. 



Fig. B. 



D/aqram- Sec/-/ on o/^ D& Beers /W/re 





Dep/-'-^ 







/oo 6 



-6S~ 



■2 7-? 



/OO a 

 /O/ 



/O/ a 



/3£iS^//' 



?04 



=£a 



5/ra/e 

 4^ 



ssAs^^/seSt 



ess 



J8J 



/'^e/aD4yre 



/ooo 

 /200 



/2eo 



/320 



/360 

 /3 S O 



/OJ 



/OJ a. 

 /OJC 



/OJ <? 

 /02'^ 



/400 

 /4dO 



/szo 

 /6dO 



jyio 

 /840 

 /920 



/// 



//S 



//So. 



///a. 



///cC 



/O3o 



/03j 



/OS/n 



//3 

 //3 i> 



/!. //. 

 A.H. 



722 



Ouar/^//e 



<2/nyqao/o/a^ ' 

 0/70/ 

 Qc/ar/j 



Poro/iyry. 



2000 



2040 



T/ie Sc//7}Ac/ 



/I//. /nc//cc/e3.s/:>ec//77e'7S co//ec/ec/ Ay 



(^ran//e 



Afr/Zcy/c/!. 



y/soTf 



