C i^i ) 
the Amethyft, and others ; likewlfe Confiderations touch- ^ 
ing the Growth of Metals and Minerals in the Earth.-: 
And touching tht Petroki4m, Bitumen, Salt, Allom, Vi- 
triol, and other Minerals in the Water of Springs : The 
Incruftations or Perrifaftions of Bodies in Springs and 
Rivers : The Eue£t that the Subterranean Heat hath up- 
on Minerals, occafioning Damps in Mines, Explofions in 
Earthquakes ; yea, oftentimes forcing the laid Minerals 
in Steams out at the furface of the Earth, where they 
fometimes occafion Fevers, and other Malignant Diftem- 
pers; and mounting up ftill higher in the Atmofph^re 
form MeteorSjare the caufe of Thunder and Lightning.S'c. 
He clofes up this Fourth Part with a Difcourft concern- 
ing Amber, which he proves to be neither a Gummous 
Subftance, tior a Marine ProduSion, but a Natural Fof» 
fil, as Flints, Agats, ^c. are, and formed at the Deluge 
as they were ; it being now found at Land, and in Coun- 
tries very diftant from any Sea, as well as upon the Sea- 
Ihores , the Sea indeed here waftiing off the Dirt and 
Earth wherein 'cwas before involved, and (b contribu- 
ting to the baring and difcovering of it, but nothing to 
its Formation. 
The Fifth Part is concerning the Alterations which 
the Terraqueous Globe hath undergone fince the time of 
the Deluge, knd having in the former Part difpatch'd 
what concerti^ -"the Changes which happen in the Inte» 
riour Parts of the Earth, by the Tranfitions and Re- 
moves of Metals and Minerals there ; in this he confi- 
ders thofe Alterations which befal the Superficial or Ex- 
teriour Parts of it : fiiewing that the upper or outermoft 
Stratum oi Earth, being the commonFund and Promp- 
tuary out of which the matter of all Animals and Ve- 
getables is derived, and into which, that matter is at lafl 
all returned back again, is in a continual Flux and Re» 
volution; and takes occafion here to Difcourfe of the 
firft Particles or Elements of Natural Things: That 
Rocks 
