C 46 3 



ed are very rare in nature. They are Palladium, 

 Rhodium, Osmium, Indium, Colubium, Chromium, Mo~ 

 lybdemm, Cerium, Tellurium, Tungstenum, Titanium, 

 Uranium. The forty-seventh body has not as yet 

 been produced in a state sufficiently pure to admit 

 of a minute examination. It is the principle which 

 gives character to the acid called fluoric acid, and 

 may be named Fluon, and is probably analogous to 

 phosphorus or sulphur. The numbers representing 

 th: so last thirteen bodies have not yet been determin- 

 ed with sufficient accuracy to render a reference to 

 them of any utility. 



The undecompounded substances unite with each 

 other, and the most remarkable compounds are form- 

 ed by the combinations of oxygene and chlorine with 

 inflammable bodies and metals ; and these combina- 

 tions usually take place with much energy, and are 

 associated with fire. 



Combustion in fact, in common cases, is the 

 process of the solution of a body in oxygene, as hap- 

 pens when sulphur or charcoal is burnt ; or the fixa- 

 tion of oxygene by the combustible body in a solid 

 form, which takes place when most metals are burnt, 

 or when phosphorus inflames ; or the production of 

 a fluid from both bodies, as when hydrogene and oxy- 

 gene unite to form water. 



When considerable quantities of oxygene or of 

 chlorine unite to metals or inflammable bodies, they 

 often produce acids : thus sulphureous, phosphoric, 

 and boracic acids are formed by a union of considera- 

 ble quantities of oxygene with sulphur, phosphorus, 



