752 



REPORT OF NATIONAL MUSEUM, 1897. 



compounds are called, are derivatives of HF, HCI, HBr, and HI, and 

 are divided chemically into four classes — duorides, chlorides, bromides, 

 and iodides — according- to the nature of the negative constituent. 

 Two of the halogens — fluorine and chlorine — enter into the composi- 

 tion of several oxidized compounds, called oxytluorides and oxychlo- 

 rides — compounds in which there is a metallic fluoride or chloride with 

 a basic oxide of the same metal. 



Molysito. 



Nantokite. 



Marsbite. 



Calomel. 



- Group 2, 



FeClii. 



Grotip 3. 



Cu.Cl,. 

 Cu,I,. 

 Hg.Cl.. 



Hexayoual. 



Isometric. 

 Isometric (?) 

 Tetragonal. 



