898 



A TREATISE ON METAMORPHISM. 



tlie United States Geological Survey. Analyses were taken only from 

 specimens which were clearly of pelitic origin. 



Average of analyses of %!2 pelite-slates. 



The following is the average of 5 analyses of pelite-schists from vari- 

 ous localities in the United States, taken from the publications of the 

 United States Geological Survey. Analyses were taken only from speci- 

 mens which were clearly of pelitic origin. 



Avet^age of analyses of 5 pelite-schists. 



