LETTER Vir. r6i 



the middle, and afterwards poliihed, fome of 

 them reprefent feveral forts of Trees, and others 

 are marked with the Figures of ruined Caftles 

 and Towns : Kircher^ adds he, calls the former 

 Defidrites^ from the Images of Trees, that ap- 

 pear on them. They are a fort of Agate, but 

 how they come to have a full grown Tree, mark- 

 ed in Miniature upon them, is not fo eafily ac- 

 counted for. JV. B. We have m.any of thefe 

 Stones termed Dendrites^ ready poliflied, to be 

 fold at Wildefs^ and fome other Toy-fliops in 

 London, 



12. In a Room at one end of St. Jokns-CGlkge^ 

 in Oxford^ I was fhewed, (among Skeletons, Birds 

 of Paradife, Pidlures, in a wonderous fmall Hand 

 Writing, of Giijiavus Adolphus^ of Sweden^ and 

 our King Charles the Firft, and other curiofities) 

 at leaft, forty Stones that were confiderably large, 

 of a greenifh brown colour, and which were taken 

 out of the paunch of an Ox, which was killed at 

 that City. Two or three of them were almoft 

 as big as a Goofe Egg, and I could perceive the 

 plain (undoubted) Marks of Piles, or Leaves of 

 Grafs, upon them, each Mark being about two 

 inches long : An evident proof, I thought, not 

 only for their growing whilft in the Ox's Belly, 

 butlikewife for their great foftncfs then, without 

 which quality^ I could not conceive them capa- 

 ble of receiving thofe impreffions. 



L 13. Befides, 



