lood
circulation and ensures its entrance into the finest capillaries--the
ultimate branches of the blood-vessels--hence, its capacity to carry
supplies of nutriment to the tissues. The disturbance of this proper
quality is among the main factors of constitutional disease.

2. _The lymphoid tissue_: The lymph is another of the life-giving
liquids of the body, which through a vascular system of its own, draws
certain nutritive substances from the food and carries them to certain
organs which it feeds, especially the nerves.

After this slow task is completed, the rest of the lymph enters the
blood and is carried by it to other parts of the body where only smaller
quantities of lymph are needed for nourishing purposes.

The proper quality and chemical composition of the lymph, which is
different from that of the blood, is of no less importance than that of
the plasma for the preservation and regeneration of the organism.

What the plasma is to the blood, the lymph is to the nerves.

3. _The nerve tissue_: A particular aggregation of cells forms the
nerves, which, emanating from their center in the brain and spine, run
as another separate system all through the body.

This system, however, is not one of vessels; but the nerves may best be
compared to the wires of a telephone system, establishing connection
between the remotest parts of the body and its central point, from which
the directions for both voluntary and involuntary movement are given and
transmitted through the nerves.

They are of a peculiar chemical composition in which the nerve fat
(lecithin) plays a very important part, since its frequent presence in
insufficient quantity is among the most common causes of a great number
of nervous and other diseases.

4. _The bone tissue_: The bones consist of a special and very distinct
tissue in which lime predominates. This gives them the strength and
solidity which enables them to act as support to all the other organs.

The bones too are fed by the blood, and it is through the blood that the
necessary constituent parts for the regeneration of their tissue is
conveyed to them.

While naturally their power of resistance is greater than that of any
other organ, they are nevertheless subject to a number of structural
disturbances, other than traumatic, the causes of which are sometimes
hereditary, sometimes acquired through deficient properties of the
nourishing blood.

Certain tissues which form the connect