INDEX. 349 



I. 



produced by petrified Bolus, 295. 312. 

 in china-clay, $$. 



in volcanic countries, common and Gratified in large 



beds, 83. 



petrifactions (whether any) extremely fcarce in Jaf- 



per, 58. 

 petrifactions in Jafper noticed, 14. 



i " a Belemnites in Jafper, 84. 



fiieils in Jafper, 27. 



(Antique, or) 



Diafpro Sanguigno ofia Hetiotrcpio, green and red fprink- 

 led. 



' fiorito reticeflate, 221. 



(green) feems to be flintified Serpentine-ftone, 302. 

 (red) on one fide ftill unpetrified Bolus, 312. 



di Volterra^ 268. 



( red and white-veined) 



in large ftrata and blocks at Barga, 83. 

 at Frankenberg, 83. 

 in Montagna dl Montieri^ 8a 

 Iceland. 



Agate. See Lava. 



Calcedonies, ftratified as parafitical ftones in a volcanic! 



matrix, 57. 



Geyfers at Laugafel, hot fpouting wells, 57. 



