e blood. Any excessive increase from this source I
have designated _leucocytosis_.

In the first months of the embryo the red cell multiplies by division.
In adult life the mode of its multiplication is unknown. They, also, are
probably formed in the lymphatic glands and spleen.

In a disease I have named _leukaemia_, the colourless blood cells
increase in number enormously. In such cases there is always disease of
the spleen, and very often of the lymphatic glands.

These facts can hardly, I think, be interpreted in any other manner than
by supposing that the spleen and lymphatic glands are intimately
concerned in the production of the formed elements of the blood.

By _pyaemia_ is meant pus corpuscles in the blood. But most cases of
so-called pyaemia are really cases in which there is an increase of white
blood corpuscles, and it is doubtful whether such a condition as pus in
the blood does ever occur. In the extremely rare cases, in which pus
breaks through into the veins, purulent ingredients may, without doubt,
be conveyed into the blood, but in such cases the introduction of pus
occurs for the most part but once, and there is no persistent pyaemia.
Even when clots in veins break down and form matter like pus, it will be
found that the matter is not really pus, and contains no pus cells.

_Chlorosis_ is a condition in which there is a diminution of the
cellular elements of the blood, due probably to their deficient
formation in the spleen and lymphatic glands.

_The Vital Processes and Their Relation to Disease. Inflammation_

The study of the histology of the nervous system shows that in all parts
of the body a splitting up into a number of small centres takes place,
and that nowhere does a single central point susceptible of anatomical
demonstration exist from which the operations of the body are directed.
We find in the nervous systems definite little cells which serve as
centres of motion, but we do not find any single ganglion cell in which
alone all movement in the end originates. The most various individual
motor apparatuses are connected with the most various individual motor
ganglion cells. Sensations are certainly collected in definite ganglion
cells. Still, among them, too, we do not find any single ganglion cell
which can be in any way designated the centre of all sensation, but we
again meet with a great number of very minute centres. All the
operations which have their source in the nervous sy