As these methods seem to me of interest, from the standpoint of their
simplicity and easy installation, I propose to describe them briefly, in
order to give as faithful and general an _apercu_ as possible of their
application. At present I shall deal with the first one only, the one
called the method by _Cadinhes_.
STUDY OF THE METHOD BY CADINHES.
The province of Minas Geraes ocupies a vast extent in the empire
of Brazil, its superficies being about 900,000 square kilometers,
representing nearly a third of the total surface.
The population is relatively small and is disseminated throughout a much
broken country, where the means of communication are very few. So it is
necessary to succeed in producing what iron is needed by means that are
simple and that require but quickly erected works built of such material
as may be at hand. The iron ore is found in very great abundance in this
region and is very easily mined.
In the center of a mass of quartzites that seem lo constitute the upper
level of the eruptive grounds of the province, there are found strata of
an ore of iron designated as _itabirite_--a mixture of oxide of iron and
quartz.
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