448 BLOOD ALBUMEN. 
The patent mentioned endeavoured to obviate these obstacles 
to the manufacture in the United States, which still are tributary to 
Europe for those products of industry, although the latter cannot boast 
of as enormous supplies of the raw material as we have at command in 
this country. 
According to the same the blood, from whatever source coming, was 
run at once into tanks of sufficient capacity to hold the blood in question, 
filled partly with water, charcoal, iron-filings, and chemicals, to promote 
the separation of the liquid from the solid parts of the blood ; the whole 
mass is thoroughly mixed by appropriate agitators and then exposed to 
rest, where the separation takes place readily in consequence of the 
dilution of the liquid and the nucleus, formed for the fibrine by the 
solid bodies present, the chemical nature of which prevents the 
evolutions of gases or odours of any description under all circum- 
stances. 
In place of rest, recourse may be had to a centrifugal for the sepa- 
ration of the serum from the blood-corpuscles, which will take place 
without loss of time, but requires some practical dexterity, so as to 
select a cloth of proper density and conforming with the speed of 
the apparatus for the complete separation of the serum without dis- 
coloration. 
The clear serum is then evaporated in a vacuum to the consistency 
of syrup, and the concentration is completed in pans, in which it also 
might be carried through from beginning to end. 
Another evaporator, used by the patentee, and offering an immense 
heating surface on the space it occupied, was described. It has but the 
advantage of cheapness over the other apparatus mentioned. 
The albumen thus produced is transparent, of straw colour, while 
that made in the old manner was dark, the best sorts having the colour 
of common glue, running through all shades to complete black. 
For the second portion of the patent the solid residue from the 
centrifugal was either calcined in peculiarly constructed carbonizers, 
which were described, or was mixed without calcination with melted 
potash in a furnace, having a cast-iron bottom, where an archimedean 
screw produced a thorough mixture of the residue and potash, both 
being used in equivalent proportions for the production of the 
prussiate. 
As an additional source of nitrogen, the gases were used issuing 
from the carbonizers mentioned, where the blood-cakes, if advantageous, 
mixed with other animal offals, were charred. Also tar-water, if such 
was cheaply and conveniently to be had. The latter had its ammonia 
fixed by an acid, and the evaporated mixture is run slowly into the 
furnace. 
The molten mass is then treated as usual, exhausted with water, and 
the resulting lye submitted to crystallization. — * American Artisan.' 
