DIAMOND MIVeS. 359 
tl'e same either in deptli ov solidiiy. Innu- 
■ ^ Mil 
to that which remains to be explored 
'! - Cof the metallic ore is contained, 
f"' tni[,„ '"ytil! , the most common opinion entertained by 
that crude immature minerals nourish and 
C'liit wliich they are intermixed in the mines ; 
tninertils theraselvc.s will, in process of time. 
^‘^cks and fissures are found in all of them; but 
®tairely difterent in sixe and shape, that .t is 
thrm any infi'rence from what may have been 
t’^'’^'tlvc to that which rema 
... . ’tt'° ‘^tes productive of those metals to which 
f .''tesf ■ tile nearest allinity, and with whicli they have the 
V 'hii'^''''^?tirse. In his mineralogy of Cornwall, Mr. 
" * filad reasonable to conclude, that metals 
fiid planted in veins, at, or very soon after, 
““ of the world; but that, in commoTi with all 
J'fQocjj- they are subject to a degree of fluctuation, 
<jf/'^tion'^ jo, or receding from, tlieir ultimate degree of 
oilher quicker or slower, as they are of greater 
i^io g ®od durable frame and constitution. He sup- 
'fith''" of 3 peculiar magnetism, and an approxi- 
iiy*Pcn;gj^^‘‘*’hcles of the same specific nature, by which its 
*ll*^*Pari' P'*ociples are drawn and united together; 
Vg ^he matters left by the decomposition of 
’V through the contiguous earths or strata, 
^^''Oretj ^ their proper nidus or receptacle, until, by 
iL 'tietaj?-'^ more or less of its homogeneous particles, 
‘tn, '0 Vein may be denominated: eltlier rich or 
DIAMOND MINES. 
titv^ th''^'"*^ attached to diamonds does not depend so 
hardnes.s, as on iJselr great scar- 
ce' fiith, aii'i iiGiAissary in ppocuring 
‘l liave been observed in the torrid 
'^ir the Brazil is the only part of the Americas 
jj]);, ^ ^ave been found. The historical account ot 
Vh' affi, *P that country is as foliow.s. Near the 
''' teiTitoi-y of Serro do Frio tlows the river Milho 
Vif "'as the custom to dig fqr gold, or rather 
."°m the alluvial soil. The miners, dining 
gold, found several diamonds, which fiver 
