214 Fretp Museum or Naturat History — Greotroey, Vot. III. 

Maonestitint i)... et. sate eo oso oe epee i ORE co og 3.80 
pulphursiy » ass owls ols ey deo ele or or eee ee .49 
Calettatin. 5 255 ia 5.4 Sie concen Gh ees eee ee .46 
Cobalt in. hs x dulce ku ayete ate coue Bigteek Opec tinge ie ete aan oa 44 
PN huerbai bts: pe ME PE TPS Rr LE req 
SOCIUE eis, eee a ene ee ee vk ty apes Bly ahees ait err AIF 
Phosphorus’ ccf Svs ccs Rado ad cen 414 
Chromium es ss avers Sea Oe eres «isles oem ee te .09 
POTASSIUM ess -eecca wie Seaton FN eve) ee ola eng ne a ee .04 
Oh g cle en PRea ee ree ewe te ree .04 
Manganese, os. saab cs ty a ean 5 Ree 2) Oe tee C3 
Other elements .o... (5052 ote reg ee ees Ce .05 
100.00 
The large proportion of iron in the constitution of the earth in- 
dicated by meteorites is in accord with the earth’s density, rigidity, and 
magnetic proportions. Assuming the density of the rocks of the earth’s 
crust to be 2.8, which may be too high, and combining with it metal 
of the density of 7.8, which is an average of the density of iron me- 
teorites, it will be found that 77.58 per cent of metal will be required 
to obtain a density of 5.57, that of the earth as a whole. This is very 
nearly that of the sum of the metals in the above result after eliminat- 
ing the proportions present as oxides. Such a proportion of iron would 
seem to be in accord, as has been stated, with the earth’s rigidity and 
magnetic properties. 
