allow or "muddy" condition of the
complexion.

94 A most valuable antiseptic ointment is prepared by the druggist from
the following formula:

Lanolin, 25 grams.
Ichthyol, 6 grams.
Yellow vaseline, 20 grams.

This is applied as a thin layer on the surface, except in the case
of boils or abscesses. In treating these a heavy layer is spread
over the affected part and then covered with absorbent cotton or a
thin piece of clean cotton cloth.

95 In a larger sense adjustment includes all those activities by means
of which the body is brought into proper relations with its
environment, including the changes which the body makes in its
surroundings to _adapt them_ to its purposes.

96 Almost to the present time, physiologists have described the nervous
system as being made up of two kinds of structural elements which
were called _nerve cells_ and _nerve fibers_. The nerve cells were
supposed to form the ganglia and the fibers to form the nerves.
Recent investigators, however, employing new methods of microscopic
study, have established the fact that the so-called nerve cell and
nerve fiber are but two divisions of the same thing and that the
nervous system is made up of, not two, but one kind of structural
element. The term "neuron" is used to denote this structural
element, or _complete nerve cell_.

97 Many of the axons in the brain and spinal cord have no primitive
sheath. Axons without the medullary sheath are found in the
sympathetic nerves. These are known as non-medullated axons and they
have a gray instead of a white color.

98 The difference in weight between the brain of man and that of woman
is due mainly to the fact that man's body is, as a rule,
considerably larger than that of woman's.

99 The nervous tissues present, at different places, two colors--one
white, and the other a light gray. Great significance was formerly
attached to these colors, because it was supposed that they
represented two essentially different kinds of nervous matter. It is
now known that the protoplasm in all parts of the neuron
proper--cell-body, axis cylinder, and dendrites--has a grayish color,
while the coverings of most of the fibers are white. Hence gray
matter in any part of the nervous system i