F. Prime, Jr.— Limonite Deposits of the Great Valley. 483 
heat which would be brought about by assuming that the origi- 
nal atoms of which a star is composed are possessed with the 
increased potential energy of combination which this hypothesis 
endows them with. From the earliest phase of a star’s life the 
tions formed with chlorine, oxygen, eer &c., in the case of 
tetrad or hexad metals. 
May we not from these ideas be justified in defining a metal, 
rovisionally, as a substance, the absorption-spectrum of which 
is Senerally H the same as the radiation-spectrum, while the metal- 
ids a the absorption-spectrum of which, generally, 
is not ne ame? In other words, in passing from a cold toa 
souraeto ae hot state, the plasticity of these latter comes into 
play, and we get a new molecular arrangement. Hence are we 
not justified in i whether the ¢ change from oxygen to 
ene - but a type of what takes place in all metalloids 
est shanks are due to Mr. R. J. Friswell for the valuable 
aid | he _ afforded me in oe investigations. 
Art. XLVI.—On the occurrence of the Brown Hematite Depos- 
ats of the Great Valley; by FREDERICK PRIME, Jr.* 
THE Great or Cumberland Valley, which (under a variety of 
names) extends from Ca nada, throu P Vermo nt, Massachusetts, 
naces situated on their + outcrops. nes on wh ich the 
ores are obtained are (properly sae elt pois pits or quarries, 
* A paper read before the Amer. Inst. of Mining Engineers at New Haven, Feb. 
25th, 1875. 
