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CLASS IV. METALS* 
A. MaileabUi 
1 So. Pla TINUMj 
Si. Aurum. 
Sj. Argentum. 
S3. Hydragyrum. 
^4" Cuprum. 
Silvery-white; very hai-d and tenacious; 
fonoroiis ; exceedingly inallea,ble and 
duftile; not melting in a white heat; 
foluble only in 16 times its weight ot 
boiling nitro-muiiatic acid, and giving 
firft a yellow and then a deeper red or 
brown colour to the folution; fpecinc 
gravity 23,000. 
Reddifli- yellow ; hardifti and tenacious; 
not fonorous ; exceedingly malleable and 
duaile ; melting in a white heat ; foluble 
only in niiro-miiriatic aeid^ and giving 
the folution a yellow colour: fpecific gra- 
vity 19,300. . 
Silvery-white; hard and tenacious; lono- 
rous; exceedingly malleable and duaile; 
melting in a white heat ; foluble in nitric 
acid, and imparting no colour to the folu- 
tion : fpecific gravity 10,500. 
Silvery-white ; fluid at the common tempe- 
rature of the atmofphere ; malleable when 
rendered folid by a fufficient degree of 
cold; evaporating in heat; foluble in mU 
neral acids, and imparting no colour to the 
folution: fpecific gravity 13,568. 
Fine red; hard and tenacious; fonorous; 
malleable and duaile ; when expofed to a 
red heat taking fire and emitting a moft 
brilliant lively green light; exploding vi- 
olently when melted and call into water, 
fpecific gravity 8,667, 
VOL. VII, — H h 
