61 
three times, when larger and rounder stones succeed, whichi 
are often Septaria, holding shells and petrified wood: un- 
der these are small or large stones, flat and squarish, some 
of three or four feet in thickness, and often arranged in a 
very ordetly. manner, with squared joints, like a castle- 
wall; between them are flat stalagmitical flakes, composed 
of rather porous and light Carbonate of Lime, looking like 
mortar, to help the deception. Often next to these are a 
few small flattish stones and a ferruginous Fuller’s Earth, 
which is sent to London for housewifery purposes. The 
Earth below this has a dark blueish slate colour for six or 
nine feet: this is brought out in lumps of from ten pounds 
to a hundred weight, carried to a shed to be weighed for 
sale, and in a few hours is placed in a waggon to send to 
be shipped near London Bridge for Yorkshire. It may be 
observed, that as it cracks in the pit by the access of the 
external air, the outsides of the lumps become more or less 
ochrey, as the second figure shows, and afterwards the whole 
bleaches, and we cannot blacken it again; for, if it be wetted, 
it becomes lighter still, and falls to pieces: this may depend 
on the Oxide of Iron, and something carbonaceous. As 
the Spec. Grav. of Fuller’s Earth is about 2, it is a curious 
fact to understand that large masses of Sulphate of Barytes* 
are found suspended in it; but of this more will be said 
hereafter. 
Kentish Fuller’s Earth, tab. 232, upper figure, is found 
at present near Bersted, but not in abundance, like that of | 
Nutfield, and is not above from three to six feet from the 
* Whose Spec. Grav. is about 4-5. 
