TAB. XCIL 



SILEX Quartzum, var. aggregatum, 



Quartzose Pudding Stone* 



Class 2. Earths. Order 3 . Aggregated. 



Gen. 2. Silex. Spec. l. Quartzose. 



Syn. Pudding Stone. Kirw. v. 1. 360. Bab. 131, 

 Quartz-agathe breche. Hatiy, v. 4. 461. 

 Poudding. R. De Lisle, v. 2. 481. 



I his is not rare, in gravel-pits, in many counties of 

 England ; Hertfordshire is however most famous for pro- 

 ducing it. Pudding Stone is little known abroad, and is 

 therefore esteemed in Germany, and other parts of the 

 continent, as an English rarity. I believe it is not found 

 either in Scotland or Ireland*. 



The most perfect and most esteemed specimens are those 

 which have the closest and finest siliceous cement, with 

 the greatest number of variegated pebbles, sometimes with 

 fanciful representations : see left hand part of the figure. 



They are much the same in texture and hardness through- 

 out, as the flint pebbles figured in tal. 88, and bear a 

 polish equally well with them. 



The upper figure is one of this sort, but is better in some 

 parts than in others. The sides show an imperfection, as 



* Though in Scotland they call some of the rocks by this name. 



