192 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



from one-sixtieth to about one-twentieth of an inch. It does not 

 adhere very strongly to the walls, which may probably be one reason 

 for the small quantity that remains attached to them. Mr. Faraday, 

 who kindly undertook to examine this, as also the other deposits which 

 will be alluded to, states that " it consists principally of carbonate 

 of lime ; but there is also present a little combustible matter, pretty 

 universally diffused through the mass; there is also a portion (small) 

 of peroxide of iron present." 



36. The following are my notes made on the spot. The dark in- 

 crustation is seen in the chamber marked C 2, fig. 1. It extends 

 over (covers) a piece of marble panelling, and is visible on the walls 

 where there is no panelling. Serpulse occur upon the incrustation 

 on the marble panelling. Its height from the floor to a dark well- 

 defined line about its middle is 3 feet 6^ inches. 



It is again visible in the chamber marked 23 C, but no Serpulss 

 were observed : height to about its middle 3 feet 4? inches. 



In the chamber 29 C, the same deposit is seen extending over the 

 stucco and over the fragments of marble imbedded in it. Its height 

 from the floor to the lower edge is 2 feet 9 inches. 



Of the Great Incrustation. 



37. At the height of about 9 feet from the floor of the temple 

 a level line runs round several of the chambers, which marks the 

 upper edge of a thick incrustation, evidently deposited from water. 

 The average depth of this incrustation is about 2 feet, but the lower 

 edge, although perfectly well defined, is not a level line ; it is in several 

 places slightly inclined and irregular, as it would have been if thelower 

 part of the temple had been filled up with ashes or sand or any other 

 substances. The incrustation covers pieces of wrought marble, 

 African red, &c., and does not fill up certain small holes in the walls 

 but incrusts the inside ; also the joints between the marble slabs are 

 indicated by a re- entering in the incrustation. 



38. This deposit is visible both on the outside and the inside of 

 the temple. At the north corner, on the outside just beyond the 

 archway, five or six dark lines could be traced, as if each had suc- 

 cessively been the line of water-level : the moulding of the archway 

 is in many parts covered with this deposit. 



In the chamber marked C 8, on the wall as you enter on the right- 

 hand, the upper edge of the deposit is level, but the lower edge in- 

 clines towards the centre of the temple. 



39. On the inner walls at the south or sea side the deposit is scarcely 

 visible, but it may be seen decidedly to exist in the chambers C to 

 the west of the great entrance. It extends over the marble panelling 

 which remains, as well as over the broken plaster. 



It is not visible on the top of the walls on the upper broken edge. 



40. The height of the upper edge of this incrustation above the 

 pavement of the cella B is 9 feet 4 inches, and its average depth 

 about 2 feet. 



This incrustation varies in thickness from one-tenth to nearly one- 

 fourth of an inch ; it is hard, and appears to consist of layers deposited 



