1814.] made during the Year 1813. '29 



seen. The green-stone, however, resembles in its appearance tran- 

 sition gr< en-stoiie very considerably. 



The researches of Cuvier and Brogniart in the environs of Paris 

 have made us acquainted with a new series of Hoetz rocks, which 

 appear to lie over the chalk, and which succeeding researches have 

 shown to be as common as the formations already known. They 

 have been seen in Spain, in the south of France, in Silesia ; and it 

 appears from Mr. Webster';, paper lately read to the Geological 

 Society, that these formations constitute almost the whole of the 

 south-east corner of England. 



Transition rocks seem ro be more abundant in Great Britain than 

 in almost rny other country hitherto explored. They constitute 

 the V. hole south of Scotland, occur in abundance in Cumberland 

 and Wales, and I traced them from Exeter as far west as Penzance, 

 along the sea shore. I found that the serpentine and diallage rock 

 of the Lizzard, and the granite of St. Michael's Mount, belong to 

 the transition class of rocks. The killas of Cornwall seems to be 

 always transition slate, and certainly is never grcy-wacke. 



The Italian valleys of Fiemmc, Fassa, and Livinalurga, have 

 been lately examined by Giuseppe Gautieri, and the rocks in them 

 found to consist of floetz trap. 



The matrix of the diamond, from a specimen brought to this 

 country by Dr. Heyne, appears evidently to be a species of amyg- 

 daloid ruck, belonging to the floetz trap formation. 



There can be little doubt, from the observations made on diffe- 

 rent kinds of agates and chalcedony, that vegetable substances 

 occasionally occur in them. Blumenbach lately observed a conferva 

 in a mocha stone ; and a plant, resembling sparganiuni erectura in 

 its fructification, in a remarkable agate brought from Japan. 



In the second part of the Philosophical Transactions for 1813 

 there is a curious paper by Mr. Trimmer, giving an account of the 

 animal remains found in digging two fields ne^r Brentford. The 

 first field, about half a mile north of Kew bridge, consists of the 

 following beds, beginning with the one nearest the surface : — 



1. Sandy loam, (> or 7 ft'et thick. 



2. Sandy gravel, a iav^ Inches thick. 



3. Loam slightly calcareous*, from 1 to 5 feet tiiick. 



4. Gravel containing water, from 2 to 10 feet thick. 



5. London clay, aljout 200 feet thick. 



The first bed contains no animal remains ; the second contains 

 snail-shells and the remains of river fish; the third contains the 

 horns and Ijones of the ox, the horns, bones, and teeth of the 

 deer, likewise snail-shells and river fish ; the fourth bed contains 

 teeth and bones of the African and Asiatic elephant, teeth of the 

 hippopotamus, Ijoties, horns, and teeth of the ox. The animal 

 remains found in the fifth l)cd are cntitcly marine. 



The beds and animal remains found in the second field corre- 

 spond with those in tlie first. 



