U KNER AL QBSKRVATIO.NS. 



manner at a bright red heat, and fragments of potassium may 

 be made to adhere by pressing them together with the hand at 

 the temperature of the air. Many metals are only malleable in 

 a low degree, and some are actually brittle, such as bismuth, 

 antimony, and arsenic. 



The metals, with the exception of mercury, are all solid at 

 the temperature of the air, but they may be liquefied by heat. 

 Their points of fusion are very different, as will appear from 

 the following table* : 



TABLE OF THE FUSIBILITY OF DIFFERENT METALS. 



Infusible below a 

 red heat. 



Cobalt rather less fusible 



than iron. 



Iron, cast . . 2786 Daniell. 



Iron, malleable . . "I Requiring the highest heat of a smith's 



Manganese . . J forge. 



Nickel nearly the same as cobalt. 

 Palladium. 



f*W;*!!&J?i!1n* before the 



blow- 



1 hir thA hPfjf- nt SmiT.n'R I . * w 



Tungsten 



Chromium 

 Titanium 

 Cerium 

 Osmium 

 Iridium 

 Rhodium 

 Platinum 

 v Columbiunv 



The metallic elements are, in general, highly fixed sub- 

 stances, although it is probable that all of them may be dis- 

 sipated at the highest temperatures. The following metals are 

 so volatile as to be occasionally distilled, cadmium, mercury, 

 arsenic, tellurium, sodium, potassium and zinc. 



* Dr. Turner's Elements of Chemistry, p. 414. 



F F 2 



Infusible in the heat of a smith's forge, but fusible 

 ! before the oxi-hydrogen blow-pipe. 



