AND ASSOCIATED ROCKS OF ANGLESEY. 



51 



The Author doubted whether the so-called steatite is really the 

 normal mineral. Dr. Hicks had entirely misapprehended him ; for 

 he had no doubt that the true serpentines of the district were 

 altered olivine rocks, and not metamorphosed schists. He con- 

 sidered the use of the term " serpentine " by the Survey, if it were 

 as stated by Prof. Hughes (which he doubted), was one which was 

 quite unjustifiable ; nor could he agree with Prof. Hughes's expla- 

 nation of the section showing an apparent intrusion of the serpentine 

 into the schist. He could not admit that either the Anglesey ser- 

 pentines or any Scottish serpentines which he had himself examined 

 could have been formed by the alteration of actinolitic rocks. 



