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From most reliable researches, then, it is fairly demonstrated,
that the circulation of tlie blood through the smaller vessels and
capillaries can be controlled by moderate electric currents artifi-
cially applied; and hence the very natural inference, that the
ordinary native or animal electric currents, which always exist
in the living and healthy human body, are as constantly influ-
encing the circulation of the blood. By such means the blood
circulation may be deranged; so also may the various secretions
from the blood be influenced. The diseases, alterations, or de-
viations of the blood are arranged by Dr. Simon in four
classes, viz.: —
The first is where the fat and fibrine are increased, while
the corpuscules are diminished; as observed, for instance, in
acute and severe inflammations of serous tissues, and as in
acute rheumatism.
In the second class the corpuscules are increased, while the
fibrine is diminished, as in typhus, small pox, and cerebral
hemorrhage.
The third class comprises those cases or conditions in which
both the fibrine and corpuscules are below par, and decidedly
deficient, while the water of the blood is increased ; as observed,
for instance, in anemia, carcinoma, scrofula, chlorosis, and the
true cholera.
The fourth class embraces those in which new matters are
contained in the blood; as, for instance, in Bright's disease of
the kidneys, and in all cases of chronic rheumatism, or wher-
ever bile, or urea, or any other substance poisons the blood.
Occasionally fat, and under certain circumstances a great
variety of minute particles of other matters, may be observed in
the human blood, by the aid of a good microscope. Therefore
we know that the blood may be actually altered in material
and cpiality, and therefore may sensibly change the working of
a part, or of the whole of the electro-nervous batteries of that
individual organism. And conditions which are so manifestly
electro-nervo-pathological, as well as humoral, are known to be,
in part at least, corrected by means of iron, quinine, phos-
phorus, and sulphur; or by farinaceous or animal food, exer-