98 EDITORIAL 



of the terms being artificial and misleading, the writer has become indifferent 

 in his use of both terms. 



Nevertheless, with regard to what Professor Russell has called plutonic 

 plugs in the Black Hills region, it may still be said that "In his description 

 of them he has mentioned nothing that demonstrates or even indicates that 

 they possess the character of a plug. In each case they may be central rem- 

 nants of small laccoliths." 



The question, whether the evidence regarding the nature of the Holmes 

 bysmalith is of the same kind as that offered for the character of the Black 

 Hills intrusions, may very well be referred to our fellow-geologist. J. P. I.] 



