a te > fe England, ‘2 ee ici 
iti ida —) oe 
two or wniotaee re ee, ee 
“99. If we judge from the lavas, the Auidity 0 of the gis. 
scent matter which constitutes the interior of the earth would 
ty the whole globe.” JAE & he ae will no donht, bein a cer- 
tain degree “ These two 
data are not in opposition to the influence which we must allow 
m 
easily compressed ; that this compressibility must have a limit; 
d t excessive heat may counterbalance its effec ore- 
that of primitive rocks in general: whence we may conclude, 
independently of any other Sowmignraiien, that the density of the 
central substances depends more their nature, than on the 
compression they undergo. They ee been arranged originally 
in the order of their specific gravities. The existence of gold 
and platinum proves that matters of very great specific gravity 
may. be found at the center of the earth.” 
Binders. the ene pei tg ossess a greater iP 
cific gravity than the average of he cae ive 
lavas, containing a notable proportion of iron, do. We a 
the 
center of the earth in particular. Gold and silver are found 
mostly in the primitive and early transition rocks. So are 
tin, titanium, scheelin, and metallic iron, fess could not 
hav ve been deeply placed in the central mas 
There is some likelihood in the hypothesis of M. Ha alley, 
Tee 
_which ascribes magnetic actions to the existence of an irregular 
mass chiefly composed of metallic iron, and having a ‘pecoliar re- 
abundantly into the composition of sb dew masses 
‘The mass of Siberian iron, that in the Lyceum at New 
York, the mass said to exist near the Mandan village, the 
