2). These particles, into which all primitive
tissues break up, are called cells. If I were to make a section of a
piece of the skin of my hand, I should find that it was made up of
these cells. If I examine the fibres which form the various organs of
all living animals, I should find that all of them, at one time or
other, had been formed out of a substance consisting of similar
elements; so that you see, just as we reduced the whole body in the
gross to that sort of simple expression given in Fig. 1, so we may
reduce the whole of the microscopic structural elements to a form of
even greater simplicity; just as the plan of the whole body may be so
represented in a sense (Fig. 1), so the primary structure of every
tissue may be represented by a mass of cells (Fig. 2).
Having thus, in this sort of general way, sketched to you what I may
call, perhaps, the architecture of the body of the Horse (what we term
technically its Morphology), I must now turn to another aspect. A
horse is not a mere dead structure: it is an active, living, working
machine.
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