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PRINCIPLES OF PHYSIOLOGY. 73
CHAPTER VI.
PRINCIPLES OF PHYSIOLOGY,
I wish now to enter more fully upon the great
pivotal science of Human or Physiology, of Human
and Life.
Development
To do this subject such justice as I desire, I must
first give a general outline of the principles of physiol
ogy, and afterward speak separately of each function,
and the laws which govern it. I must do this to show
what man was meant to be, and is, in a condition of
healthy development; and we shall then the better un
derstand his diseased conditions, and what is necessary
to their cure.
I beg, therefore, for what I am now about to write,
the most earnest attention, and I invoke a spirit of calm,
candid inquiry, that seeks simply for the truth. I pray
you to clear your mind of cant. "Put off thy shoes
from off thy feet, for the place where thou stundest ia
holy ground."
The simple primitive form of organic life is a cell, or
vesicle. As commonly seen by the microscope, there
is a cell, within the cell a nucleus, and within that a
point called a nucleolus : cell within cell. The cell ia
a growth, a formation, a vegetation. It is the manner
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