DIVISION IL. 
THE S!/RUCTURE OF 'THE PLANT AND 
OFFICES OF ITS ORGANS. 
CHAPTER L 
GENERALITIES. 
We have given a brief description of those elements 
and compounds which constitute the plant in a chemical 
sense. ‘lhey are the materials—the stones and timbers, so 
to speak—out of which the vegetable edifice is built. It 
is important in the next place to learn how these building 
materials are put together, what positions they occupy 
what purposes they serve, and on what plan the edifice is 
constructed. 
It is impossible for the builder to do his work until he 
has mastered the plans and specifications of the architect. 
So it is hardly possible for the farmer with certainty to 
contribute in any great, especially in any new degree, to 
the upbuilding of the plant, unless he is acquainted with 
the mode of its structure and the elements that form it, 
It is the happy province of science to add, to the vague and 
general information which the observation and experience 
of generations has taught, a more definite and particular 
knowledge,—a knowledge acquired by study purposely 
and carefully directed to special ends, 
An acquaintance with the parts and structure of the plant 
ig indispensable f.r understanding the mode by which 
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