716 THE JOURNAL OF GEOLOGY. 



course, not intended by the use of the word " slightly " to intimate that the author did 

 not recognize the true nature of the green-schists of the region. It is well known that 

 in the article referred to that he emphasized particularly the fact that the schists are 

 metamorphosed basic eruptives. He also showed that many of the rocks which still 

 preserve their diabasic and basaltic characters are nevertheless " slightly " schistose, and 

 it is this fact to which it was ^desired by the writer to call especial attention. This 

 correction is made to prevent misapprehension of the writer's attitude toward the val- 

 uable contributions of Dr. Wadsworth to our knowledge of the greenstone-schists of 

 the Lake Superior region. Vide also : Report of the State Board of Geological Sur- 

 veys for the years 1891 and 1892. Lansing, 1893. Pp. 124-125 and 133-141. 



W. S. B. 



