MINERAL OGY« 
9J 
and is faid to be iifed for walliing 
inftead of foap« 
B. Of very fine particfes : Fine Stone 
Marrow. 
Yelbwifli brown, T err a Lemnla. 
Is of a fbining texture, falls to 
pieces in the v^ater with a crackling 
noife ; it is more indurated than the 
precedent, but has otherwife the 
lame qualities 
SECT. LXXXV. 
C Bole, Bolus, ' 
Is a fine and denfe clay of various colours^’ 
containing a great quantity of iron, which 
makes it inipollible to know the natural and 
ipecifical qualities of the bole itfelf, by any 
eafy method hitherto in life. It is not eafily 
foftened in water, contrary to what the por- 
celain and the common clays are (^. & E.)^ 
but either falls to pieces in form of fmall 
grains, or repels the water, and cannot be 
made dudlile. In the fire it grows blacky 
and is then attradled by the load-flone. 
^ This cannot properly be called a fuller^ s . earthy fince it 
ffieither is of that kind ufed in the fulling buiinefs, nor is 
likely to be applicable to it J, It is, befides, a very fcarce 
clay. It is not found indurated, fo far as 1 know j and if 
it Ihculd at any time be difcovercd, it will be necelTary to 
examine, if it is not a Zeolites (or the eighth order), or at 
lead very nearly approaching to it, in regard to the effeds 
both undergo in the lire, 
I As tile beft fort of Fuller’s Earth ilid not come Into our author’s hands, 
Jit is no wonder thac he excludes it from its due place. The true Fuller’s 
Earth of England is exactly hke the ffcone marrow in all the above- 
mentioned properties ; and in regard to the. texiure and colour, it comes 
nearell to the above-dekribed coarfe ftoue marrow, £. 
S'E C T. 
