Fossils* 1 6-5 



Amber is a bitumen generally of a yel- 

 low or brown colour. It is found either 

 under the surface of the ground, among 

 the clay, sand, and iron bog ore, when it 

 is called yissz/ amber, or is thrown on the 

 shore by the waters of the sea, and is then 

 called mineral amber. It is tasteless, but 

 when rubbed it yields a faint odour, and 

 manifests electric powers. 



IV. Metals. We are at present ac- 

 quainted with twenty -one metallic sub- 

 stances, essentially different from each 

 other; gold,platina, silver, mercury, lead, 

 copper, iron, tin, zinc, bismuth, antimony, 

 arsenic, cobalt, nickel, manganese, molyb- 

 dena, wolfram, chrome,uranium,titanium % 

 and tellurium. 



Metals exceed all other fossils in spe- 

 cific gravity ;* but there exists, in this 



*The specific gravity of any body is the proportion 

 which its weight bears to the weight of another 

 body of equal bulk. The established custom is to 

 compare all bodies with water, the specific gravity 

 of which is reckoned one, or unity; so that when 

 the specific gravity of anybody, asGold,for instance, 

 5s said to be 19, Zinc 7, we mean that equal quan- 

 tities of Water, Gold, and Zinc weigh respectively 

 1, 19, and 7, be they pounds, ounces, grains, or any 

 other weights. O2 



