wherry: the habitat of the walking ferx 



677 



the first 5 are of types to which the term calcareous is generally 

 applied, lime being present as carbonate, so that the rocks effer- 

 vesce when acid is applied. The remainder comprise igneous, 



TABLE 1 

 Results of Analyses 



" In this column the capital letters stand for the following localities: 

 A. = Allentown, Pa., H. = Harpers Ferry. \Y. Va.. L. = Lewisburg. Pa., and 

 W. = Washington. D. C. 



