622 MANUAL OF NATURAL HISTORY. 



7. Family. — lodiniides. Mineral substances con- 

 taining mostly compounds of Iodine. Occur 

 combined with metals as " Iodides/' in some 

 springs, but especially in the sea. Symb. I. 



IX. ORDER — Rhetinexides. 



Eesins and other organic compounds. 



1. Family — Asphaltides. Mineral substances prin- 



cipally composed of bituminous compounds, 

 contain Carbon and Hydrogen. Occur as 

 Bitumen, Naptha, Petroleum, Asphalte, 

 Mineral Oil, &c, issuing from rocks in coal 

 formations, also in lakes, and on the shores 

 of the Dead Sea. 



2. Family. — Electrides. Mineral substances prin- 



cipally composed of resinous compounds, con- 

 tain Carbon, Hydrogen, and Oxygen. Occur 

 as Amber, Retinite, Fossil-copal, Mountain- 

 tallow, Mellite, &c. 



