6 BULLETIN 33, UNITED STATES NATIONAL MUSEUM. 



far as possible the uame of the authority for the species has been given 

 in italics. Tlie sjuonyms under each species have been divided into 

 classes where that is necessary, and then arranged alphabetically for 

 convenience in referring to them. The symbols representing t. e com- 

 position of the minerals have been given according to the new system, 

 as that seems mostly to accord with the modern progress. 



It would not have been possible for me, with all my other duties, to 

 have done this work without the very careful and zealous assistance '-f 

 Mr. A. J. Moses, instructor in mineralogy of the School of V jd 



the active co-operation of my assistant, Mr. Struthers, and to tu^se gen- 

 tlemen I gratefully acknowledge my indebtedness. 



THOS. EGLESTOK 



School of Mines, Columbia College, 



New Yoric, December 1, 1886. 



