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of a pale brownilh grey Colour, but from 

 its lax Structure fubjed to extraneous 

 Mixtures. Dr. Lawfon was the firfl who 

 aflerted from a Courfe of Experiments, 

 that Calamine was the Ore of Zink, which 

 is known in England by the Name of 

 Spelter : Zink is very frequently brought 

 us from the Eaft Indies^ under the Name 

 of Tutenag it melts in a very fmall Fire ; 

 both Calamine and Zink turn Copper into 

 Brafs. Calamine is found in great Plenty 

 in England^ particularly in SomerfetJJiire. 



In one of the Tables near the Windows 

 on the Right-hand, are a great Number 

 and Variety of Agates^ Onyxes^ and Sardo- 

 nyxes^ rough and polilhed ^ fome of them 

 are fmall like Seeds, which in the Beds 

 where they are found, meeting with pro- 

 per Particles, by a natural Coalition, and 

 affifced by the Heat of the Sun in warmer 

 Climates, encreafe in Bulk. The Agate 

 is a femi-pellucid Gem, variegated with 

 Veins and Clouds, but without Zones 

 the feveral Kinds are of different Colours, 

 E 6 The 



