492 H. p. GUSHING ASYMMETRIC DIFFERENTIATION IN SYENITE 



there is no chemical difficulty in the way. If the syenites of the region 

 do tend to differentiate a more acid border, the basic border adjacent to 

 the anorthosite is all the more remarkable, and it is there that the major 

 part of the field evidence suggesting incorporation is found. The in- 

 stance of the acid syenite in Litchfield park passing into basic syenite 

 around the large anorthosite inclusion there will be recalled in this con- 

 nection. 



In conclusion it may be said that while the chemical evidence is by 

 no means of satisfactory nature, owing mainly to the lack of selected 

 analyses made with this problem in view, yet that it does not seem to 

 afford any valid argument in opposition to the field evidence, which does 

 distinctly suggest the incorporation and digestion of material from the 

 surrounding rocks, especially from the anorthosite, as the cause of the 

 peculiar differentiation of the syenite. 



